United Airlines, Inc. (“United”) interviewed and rejected Ms. Bullington for the position of line pilot/flight officer on three separate occasions. Ms. Bullington brought this action pursuant to Title VII of the Civil Rights Act of 1964, 42 U.S.C. § 2000e et seq., and the Age Discrimination in Employment Act (“ADEA”), 29 U.S.C. §§ 621 — 634, claiming United refused to hire her because of her gender, her age and in retaliation for complaining about alleged discrimination during the interview process. Ms. Bullington further claims United breached an implied contract or an otherwise enforceable promise by refusing to hire her. The district court granted United’s motion for partial dismissal and United’s subsequent motion for summary judgment, and Ms. Bullington appeals. We have jurisdiction pursuant to 28 U.S.C. § 1291, and affirm in part and reverse in part.
I. Background
Ms. Bullington, a female over the age of forty, currently works for United as a ground school academic instructor. Over a two-year period, Ms. Bullington sought but was denied a position as line pilot with United on three occasions. United’s application and selection process for flight officers involves three phases. In the initial phase, United accepts applications from individuals meeting certain minimum qualifications including 350 hours of flight experience, commercial pilot certification, a high school diploma, and other physical and medical requirements. United then ranks eligible applicants according to aeronautical experience. Those applicants ranked at the top of the list advance to the *1309 second phase of the selection process. Because female applicants typically have less aeronautical experience than male applicants, United ranks male and female applicants separately. United then selects a proportionate number of males and females to proceed to the second phase. At the second phase, applicants must complete a simulator flight and a formal interview. Based on the applicant’s performance, a review board then decides whether to reject the applicant or to extend a conditional offer. If United extends a conditional offer, the candidate moves on to the third phase, which includes a medical exam and background check. Ms. Bullington objects to the formal interview portion of the selection process.
Two United employees conduct the formal interview, an employment representative and a flight operations representative. These individuals assess the applicant in seven broad categories or “dimensions” including: industry motivation, decision making/problem solving, compliance and conformity, leadership, interpersonal skills, technical evaluation, and appearance/presentation. Each dimension is broken down into a set of attributes or “anchors” United deems desirable in a flight officer. Interviewers ask applicants questions from a suggested list and, based on the applicant’s response, evaluate whether the applicant meets United’s set standards for each attribute. 1 Based on those attribute evaluations, the interviewers give the applicant a numerical score for each dimension, ranging from a low of “1” to a high of “5.” The dimension scores are then averaged to arrive at the applicant’s overall score. An applicant must have an overall score of “3” or better to be recommended for a flight officer position. However, if an applicant scores a “2” or lower on any one dimension, her overall score will also be a “2,” and the interviewers will not recommend her for a flight officer position.
United interviewed Ms. Bullington for a flight officer position three times — January 1993, March 1995 and May 1995. Each time, Ms. Bullington received an overall score of “2,” thereby disqualifying her from further consideration. After her first unsuccessful interview in January 1993, Ms. Bullington spoke with Ms. Nancy Stuke, United’s Manager of Flight Officer Employment, and expressed her concerns .that one of her interviewers was biased against her. Ms. Bullington claims Ms.. Stuke failed to adequately address her complaints. After unsuccessfully interviewing a second and third time, Ms. Bull-ington filed suit alleging: (1) United failed to hire her on all three occasions because of her sex and age, (2) United failed to hire her in 1995 in retaliation for her complaints to Ms. Stuke in 1993, and (3) United’s failure to hire her breached an implied contract or otherwise enforceable promise for career advancement.
United moved to dismiss Ms. Bulling-ton’s claims to the extent they were based on Ms. Bullington’s January 1993 rejection because those claims were barred by the statute of limitations. The district court agreed and granted United’s motion. United then moved for summary judgment on Ms. Bullington’s remaining claims. The district court granted that motion as well, concluding Ms. Bullington faded to establish a prima facie case of age or sex discrimination under either a disparate impact or disparate treatment theory, failed to establish a prima facie case of retaliation, and failed to present sufficient evi *1310 dence of an enforceable contract or promise. On appeal, Ms. Bullington argues: (1) the district court erred in concluding her claims based on United’s 1993 hiring decision were barred by the statute of limitations; (2) genuine issues of material fact exist regarding her claims of sex and age discrimination, retaliation, and breach of contraet/promissory estoppel; and (3) the district court erred in using a deferential standard of review in connection with United’s hiring decisions.
II. Statute of Limitations
In Colorado, ADEA and Title VII complainants must file a charge of discrimination with the Equal Employment Opportunity Commission (“EEOC”) within 300 days after the alleged unlawful discriminatory practice occurred.
2
42 U.S.C. § 2000e-5(e)(l); 29 U.S.C. § 626(d)(2). This filing is a prerequisite to a civil suit under either statute.
Aronson v. Gressly,
Ms. Bullington attempts to avoid this apparent untimeliness by invoking the continuing violation doctrine. Under that doctrine, a plaintiff may recover for incidents which occurred outside the statutory time limit if at least one instance of the alleged discriminatory practice occurred within the limitations period and the earlier acts are part of a “continuing pattern of discrimination.”
Martin v. Nannie and The Newborns, Inc.,
(i) subject matter — whether the violations constitute the same type of discrimination; (ii) frequency; and (iii) permanence — whether the nature of the violations should trigger an employee’s awareness of the need to assert her rights and whether the consequences of the act would continue even in the absence of a continuing intent to discriminate.
Id. at 1415.
Applying these factors, the district court determined that the events arising in 1993 and the later events in 1995 did not constitute a continuing violation. Instead, the court concluded the 1993 non-hire was an isolated event and, moreover, Ms. Bullington had reason to believe she was a victim of discrimination as early as 1993. As such, the court found application of the continuing violation doctrine inappropriate and Ms. Bullington’s claims, to the extent they relied on the 1993 conduct, untimely. The court therefore dismissed those claims for failure to state a claim upon which relief may be granted.
3
We review de novo the district court’s dismissal for failure to state a claim upon which relief can be granted.
Mascheroni v. Board of Regents,
The continuing violation doctrine “is premised on the equitable notion that the statute of limitations should not begin to run until a reasonable person would be aware that his or her rights have been violated.”
Martin,
Ms. Bullington also argues for a continuing violation based on her statistical evidence of a pattern and practice of discrimination. It is true that a continuing violation may be based on either a series of related acts taken against a single individual or the maintenance of a company-wide policy or practice of discrimination.
See Purrington,
The district court properly dismissed Ms. Bullington’s discrimination claims for events arising in 1992/1993 as time barred. 5 We therefore turn to our review of the district court’s grant of summary judgment on Ms. Bullington’s remaining claims.
III. Disparate Impact
Ms. Bullington alleges both disparate treatment and disparate impact claims under Title VII. A disparate impact claim involves employment practices that are “fair in form, but discriminatory in operation.”
Griggs v. Duke Power Co.,
Ms. Bullington argues United’s interview process caused a significant disparate impact on women. As is typical in disparate impact cases, Ms. Bullington relies on statistical evidence to establish her prima facie case. Her statistics compare the “pass rates” of male and female applicants who interviewed for United flight officer positions. The “pass rate,” as defined by Ms. Bullington’s expert, represents the number of applicants who received an overall score of “3” or better on the interview. 6 For interviews conducted after 1994, the pass rate for women was 27.9% while the pass rate for men was 46.6%. As such, the women’s pass rate is equal to only 60% of the pass rate for men — a statistically significant disparity under EEOC guidelines. See 29 C.F.R. § 1607.4(D) (stating that a selection rate for a protected group which is less than 80% or % of the selection rate for the majority group is generally regarded as evidence of adverse impact). This disparity, Ms. Bullington argues, is significant enough to establish a prima facie case of disparate impact discrimination.
The district court disagreed. It determined Ms. Bullington’s statistics did not establish a prima facie case because they faded to compare similarly situated individuals. Specifically, the court noted that women interviewees for flight officer positions generally have less aeronautical experience than male interviewees. Although its reasoning is somewhat unclear, the court apparently assumed that the male interviewee’s advanced aeronautical experience level allowed them to perform better during interviews, thereby accounting for the higher male pass rate. Be *1313 cause Ms. Buffington's statistics did not factor in this difference in experience level, the district court found the analysis “not particularly meaningful,” and granted United’s motion for summary judgment.
We review the district court’s grant of summary judgment de novo, applying the same legal standard as the district court.
Simms v. Oklahoma,
Ms. Buffington used a type of statistics called applicant flow data to establish her disparate impact claim.
7
Applicant flow data, long recognized as an acceptable comparison model in discrimination cases, generally contrasts the racial or gender composition of persons who applied for the position and persons holding the at-issue jobs.
See, Wards Cove Packing Co., Inc. v. Atonio,
After examining the facts and circumstances of this case, we find Ms. Bulling-
*1314
ton’s statistical data sufficiently reliable to raise a genuine issue of material fact regarding the existence of a statistical disparity. Her analysis identified a specific employment practice (the interview) and identified two relevant populations for impact comparison — persons who interviewed for flight officer positions and persons who received a passing score on the interview.
See Wards Cove,
This is not to say Ms. Bulling-ton’s statistics are without fault. As the district court noted, her analysis fails to account for differences in male and female interviewees’ aeronautical experience — a potentially non-discriminatory explanation for the disparate impact.
Cf. Fallis v. Kerr-McGee Corp.,
Nor do we suggest United cannot rebut Ms. Bullington’s statistics. We simply conclude the district court’s basis for granting summary judgment was insufficient, and United has not shown an absence of issues of material fact with respect to Ms. Bullington’s
prima facie
case. United did attempt to demonstrate the incompleteness of Ms. Bullington’s statistics by listing the relative aeronautical experience of male and female flight officers actually hired during the relevant time frame. However, United did not correlate this data with the interview pass rates in any meaningful way and we are left to speculate about the actual impact of experience level on interview performance. Thus, while United’s evidence does show a potential weakness in Ms. Bullington’s statistics, we are unable to conclude that the evidence is so one-sided that United must prevail as a matter of law.
See Anderson,
IV. Disparate Treatment
Ms. Bullington next asserts that the district court erred in granting summary judgment on her disparate treatment claims. Disparate treatment claims involve “the most easily understood type of discrimination” in which an employer treats an individual less favorably than others because of her protected status.
International Bhd. of Teamsters,
After applying this framework, the district court discerned two bases for granting summary judgment. First, the court concluded that Ms. Bullington failed to establish a
prima facie
case of disparate treatment. Second, the court determined Ms. Bullington failed to present any evidence that United’s proffered reasons for not selecting her were a pretext for discrimination. Of these two bases, the district court appears to have focused more closely on the second, scrutinizing United’s proffered reasons for not hiring Ms. Bull-
ington
— i.e., her poor performance during the interviews-and Ms. Bullington’s attacks on those proffered reasons. We therefore find it appropriate to assume, for the purposes of this opinion, that Ms. Bullington established a
prima facie
case of discrimination and proceed directly to the second and third steps of the
McDonnell Douglas
analysis.
11
See V-1 Oil Co. v. Utah State Dep’t of Public Safety,
The district court concluded that United chose not to hire Ms. Bulling-ton because she did not meet criteria United believed necessary for a position as flight officer. The court emphasized that all four United representatives who interviewed Ms. Bullington concluded that she did not possess “attributes” United considers essential for flight officers and gave her unsatisfactory ratings in several of the seven “dimensions” United uses to assess flight officer suitability.
12
Thus, the district court essentially found that United
*1317
articulated legitimate, nondiscriminatory reasons for not hiring Ms. Bullington. The record supports this conclusion. The only remaining issue, then, is whether Ms. Bullington has shown “that there is a genuine dispute of material fact as to whether the employer’s proffered reason for the challenged action is pretextual.”
Randle v. City of Aurora,
To establish pretext a plaintiff must show either that “a discriminatory reason more likely motivated the employer or ... that the employer’s proffered explanation is unworthy of credence.”
Texas Dep’t of Community Affairs v. Burdine,
In this case, Ms. Bullington bases her pretext argument on the following evi-denee: disputes regarding things she said and did during the interview, the interviewers’ use of gender and age stereotypes, a comparison of her qualifications with those of successful flight officer interviewees, and statistical evidence. We conclude that, even viewing this evidence in the light most favorable to Ms. Bullington, it fails to demonstrate a genuine issue of fact as to whether United’s reasons for not hiring her were pretextual.
First, Ms. Bullington fists numerous disputes she has with the notes and summaries prepared by her interviewers. The disputed “notes” are essentially the United representatives’ informal, handwritten notations of Ms. Bullington’s responses to various questions during the interview. The “summaries” are typed memos in which the interviewer summarizes and assesses Ms. Bullington’s performance and makes a final recommendation regarding hiring. Ms. Bullington claims the notes and summaries are not accurate reflections of her interview performance. Further, she contends that those inaccuracies amount to fact issues regarding the legitimacy of United’s proffered reason for not hiring her and that the district court improperly ignored them in granting summary judgment. We disagree.
A review of the record shows that the vast majority of the “factual disputes” alleged by Ms. Bullington are in reality her opinion that the interviewers were wrong in their assessment of her qualifications. 13
*1318
However, her own opinions about her qualifications do not give rise to a material fact dispute.
See Simms,
Likewise, we find little merit in Ms. Bullington’s argument that United based its employment decisions on gender and age stereotypes. Our review of the record reveals little that could be construed as stereotyped assumptions about the qualifications, work habits, or personality traits of female or older interviewees. See, e.g.,
Price Waterhouse v. Hopkins,
Next, Ms. Bullington offers a comparison of her qualifications with those
*1319
of seven other male and/or younger individuals that United interviewed and hired as flight officers. She claims United hired these individuals despite the fact many were less qualified than her or, in many cases, had the same deficiencies identified during her interview. As such, she argues, there is reason to disbelieve United’s proffered nondiscriminatory reasons for not hiring her. It is true that a comparative analysis of job applicants’ qualifications may be relevant in proving pretext where, as here, the employer claims lack of qualification as reason for an employment decision.
See Sanchez v. Philip Morris,
A comparison of Ms. Bullington’s qualifications with those of the other interviewees in this case gives us no reason to question United’s explanation for its hiring decision. Ms. Bullington evidence does not show that she was overwhelmingly better qualified than the other candidates. At most, the seven other candidates were similarly qualified and the fact that United chose between them is not evidence of pretext.
See Sanchez v. Philip Morris,
Last, Ms. Bullington argues that the same statistical analysis of male and female pass rates she offered as evidence of disparate impact is also persuasive evidence of pretext. We disagree. The probative value of statistical evidence varies greatly according to the type of discrimination alleged. In a disparate impact case, statistical evidence plays a central role because the plaintiff is attempting to show a particular practice had a disproportionate impact on a particular group, and not the employer’s discriminatory intent. However, in an individual disparate treatment case, the focus is on how and why an employer treated a particular individual the way it did. As such, statistical evidence of the employer’s general hiring patterns is considerably less probative.
See LeBlanc v. Great American Ins. Co.,
In the instant case, we find the statistics insufficient to allow a reasonable trier of fact to infer that United’s proffered reasons were a pretext for discrimination. First; the statistics do not compare the ages of successful and unsuccessful interviewees and are thus totally irrelevant to
*1320
Ms. Bullington’s disparate treatment claim under the ADEA. Second, the statistics were designed to reflect the generalized impact of United’s interview process on women applicants. They do not address United’s specific reasons for not hiring Ms. Bullington, namely her poor interview performance and lack of qualifications. The statistics thus shed little light on the central issue of the pretext analysis — the motive behind United’s decision not to hire
Ms. Bullington. See id.,
In sum, we hold that Ms. Bullington has adduced insufficient evidence for a reasonable trier of fact to infer that United’s decision not to hire her was motivated by sex or age animus. The district court’s decision to grant summary judgment in United’s favor on Ms. Bullington’s disparate treatment claims was thus proper.
V. Retaliation
Ms. Bullington claims United retaliated against her based on a conversation she had in March 1993 with Ms. Stake, United’s Manager of Flight Officer Employment. During this conversation, Ms. Bullington allegedly informed Ms. Stake of her “strong concerns” that one of her interviewers in the 1993 interview was biased against her. Because of this complaint, Ms. Bullington claims Ms. Stake retaliated against her by influencing the interviewers’ hiring decisions in her 1995 interviews. As proof of Ms. Stake’s animus towards her, Ms. Bullington points to a conversation which occurred shortly before her March 1995 interview between Ms. Stake and Mr. H. Jeffery Bartels about a recommendation Mr. Bartels submitted in support of Ms. Bullington’s flight officer application. In his affidavit, Mr. Bartels states that Ms. Stake asked him if he was sure he wanted to submit a recommendation for Ms. Bullington and told him that Ms. Bullington acted like a “real airhead” and “held a troll doll for good luck” during her previous interview. Ms. Stake also allegedly suggested that if Mr. Bartels wanted to assist Ms. Bullington, he would help her be “more professional” in her next interview.
To establish a
prima facie
case of retaliation, Ms. Bullington must show: “(1) she was engaged in protected opposition to Title VII or ADEA discrimination; (2) she was subjected to adverse employment action; and (3) a causal connection existed between the protected activity and the adverse employment action.”
See Sanchez v. Denver Pub. Schls.,
The district court concluded summary judgment in favor of United was appropriate because Ms. Bullington failed to establish a nexus or causal connection between her 1993 complaint to Ms. Stake and the interviewers’ hiring selections in 1995. We agree. The interviewers’ decisions in 1995 were remote in time from Ms. Bullington’s 1993 complaint, thus undercutting an inference of retaliatory motive.
See Burrus,
VI. Breach of Contract/Promissory Estoppel
Lastly, Ms. Bullington claims the district court erred in granting summary judgment on her breach of contract or promissory estoppel claims. Ms. Bulling-ton contends the United representative who initially interviewed her for the position of academic instructor told her United loved to hire from within and after one year’s work, she would be “almost guaranteed a job.” In addition, Ms. Bullington claims the second United representative who interviewed her for the flight instructor position told her “it will take you a year and they’ll hire you as a pilot,” and the United Vice President for Flight Standards and Training told all academic instructors on many occasions United employees could and usually did work their way up. Ms. Bullington argues these statements amount to a “promise[ ] of preferential treatment and a virtual guarantee of employment as a flight officer.”
*1322
Under Colorado law, an implied contract can arise out of a company’s personnel policies and procedures.
See Vasey v. Martin Marietta Corp.,
After a thorough review of the record, we conclude that no reasonable juror could find that the statements Ms. Bullington allegedly relied on amount to an enforceable contract or promise. The statements, at most, constitute vague assurances about career advancement opportunities and a general preference for promoting from within.
See Vasey,
The district court’s partial dismissal of Ms. Bullington’s claims on statute of limitations grounds and its grant of summary judgment in favor of United on the disparate treatment, retaliation, and breach of contract/promissory estoppel claims is AFFIRMED. The district court’s grant of summary judgment on the disparate impact claim is REVERSED and that claim is REMANDED for further proceedings.
Notes
. For example, under the dimension "leadership,” United lists "responsibility” as a desired attribute or anchor. To evaluate whether an applicant meets United standards, United suggests the following questions, "What has been your most disappointing leadership experience? What did you learn from that situation?” The interviewer then evaluates the applicant's answer according to United’s guidelines for that anchor. An applicant meets United's "responsibility” standards if she accepts responsibility for her own actions. The applicant exceeds United standards if she accepts responsibility for her own and her subordinate's actions and initiates corrective action. The applicant falls below United standards if she blames others for non-performance or failure.
. The 300-day filing period applies to "deferral states” in which the EEOC defers to the enforcement efforts of a state agency empowered to undertake employment discrimination investigations. 42 U.S.C. § 2000e-5. Otherwise, the filing period is 180 days. Id.
. We note that Rule 12(b)(6) is a proper vehicle for dismissing a complaint that, on its face, indicates the existence of an affirmative defense such as noncompliance with the limitations period.
See Robinson v. Dalton,
. Our decision in
Martin
does nol require a different result. In
Martin,
we concluded that plaintiff's allegations of a consistent and frequent pattern of sexual harassment were sufficient to raise a triable issue on her continuing violation claim even though she failed to demonstrate all three factors in the continuing violation analysis.
. Ms. Bullington does not appeal nor do we consider the district court's dismissal of that portion of the implied contract claim based on events arising in 1992/1993.
. As such, Ms. Bullington’s statistics do not reflect the number of men and women United actually hired as pilots, since not all applicants who received a "passing” score were hired or even made an offer.
. We note Ms. Bullington’s data differ somewhat from traditional applicant flow data in that it compares persons who interviewed for the át issue position with persons who received a passing score, rather than comparing persons who applied for the at issue position with persons who were hired.
. For example, an employer’s hidden hiring preferences may indirectly affect the overall make-up of the applicant pool.
See, e.g., International Bhd. of Teamsters v. United States,
. We recognize that some statistical analyses may be so incomplete as to be irrelevant.
See Bazemore,
. Because the district court never reached the second step of the disparate impact analysis, we decline to address any arguments relating to business necessity/job-relatedness of the interview process or the proper level of deference the court should give to United’s showing under
Spurlock v. United Airlines, Inc.,
. United argues we should consider these arguments at the
prima facie
stage of the
McDonnell Douglas
analysis because they relate to Ms. Bullington's qualifications for the at-issue position. Our decision in
Kenworthy
v.
Conoco, Inc.
precludes such an approach.
To avoid this result, we held that the defendant’s reasons for not promoting the plain
tiff
— i.e., her failure to meet subjective cz'iteria for the at-issue position-should be considered in addressing whether those articulated reasons are legitimate or pretextual and not as a challenge to the sufficiency of plaintiff’s
prima facie
case.
Id.
at 1470;
see also Thomas v. Denny’s, Inc.,
This reasoning applies with equal force to the instant case. We will not allow United to "short circuit” the McDonnell Douglas analysis by challenging Ms. Bullington’s qualifications at the prima facie stage. Such an approach would unduly limit our ability to consider Ms. Bullington’s evidence that United's assessment of her qualifications was a pretext for discrimination.
. Specifically, United interviewers gave Ms. Bullington unacceptable scores in six of the seven dimensions. Among other alleged deficiencies, United claims Ms. Bullington’s pre *1317 sentation and interpersonal skills were very poor, that her responses indicated a significant lack of confidence, focus and motivation, and that each interviewer had serious doubts about her leadership abilities, problem-solving skills, dependability and ability to focus on goals. Ms. Bullington also received failing scores in her technical evaluations.
. By and large, Ms. Bullington claims the interviewers relied on misinterpretations, inaccurate assumptions, and highly subjective evaluations, and twisted her responses out of context. For example, one United interviewer indicated that Ms. Bullington demonstrated an inability to focus on her career and education goals and that her background raised serious concerns about her dependability and long term commitment to United. In response, Ms. Bullington “disagrees” with the interviewer's comments and states that the interviewer failed to giver her credit for the fact that she put her job duties at United ahead of her educational goals or that she had completed her G.E.D. and flight school while raising seven children and working several jobs. Ms. Bullington obviously has her own opinions about her qualifications for the flight officer position. Those subjective opinions, however, do not demonstrate a fact dispute about the genuineness of United's assessment of her qualifications.
See Kariotis v. Navistar Int’l Transp. Corp.,
. Ms. Bullington argues the district court, relying on our decision in
Spurlock,
. Ms. Bullington also contends the interviewers “did not report her interview responses accurately, misinterpreted what she had said and twisted her responses out of context” and claims that some of the interviewers’ summaries are inconsistent with their notes or with their testimony in this case. We have reviewed these alleged inconsistencies and find them to be insignificant at
best
and too minor to give rise
to
an inference of pretext.
Cf. Lucas v. Dover Corp.,
