This case requires us to decide whether the City of New York (“City”) fire alarm inspectors must be compensated under the Fair Labor Standards Act (“FLSA”), 29 U.S.C. § 201 et seq., for all or part of their commuting time from home to work and back because they are required by their employer to carry and keep safe necessary inspection documents during their commutes. Plaintiffs-appellants Rajkumar Singh, Thomas S. Matthews, Vivek N. Pa-til, Trushant Shah, Faramarz Robeny and Fredo Joseph (collectively the “plaintiffs”) appeal from a June 2, 2006 judgment of the United States District Court for the Southern District of New York (Castel, J.), granting summary judgment in favor of the defendant-appellee City and denying the plaintiffs’ cross-motion for summary judgment. We hold that, in the particular circumstances of this case, the mere carrying of inspection documents without any other active employment-related responsibilities while commuting is not work under the FLSA, except to the extent that it increases the duration of the commute. The record shows that any increase in commuting time in this case is de minimis as a matter of law and thus not compensa-ble under the FLSA. Therefore, we affirm the district court’s grant of summary judgment, concluding that none of the plaintiffs’ commuting time is compensable under the FLSA. In addition, we conclude that Singh’s First Amendment retaliation claim is without merit because his speech was not a matter of public concern and was made only in his capacity as an employee and not as a citizen.
BACKGROUND
For purposes of this appeal, we accept as true the plaintiffs’ version of the facts and all other undisputed facts. The plaintiffs are employed by the City as inspectors within the Fire Alarm Inspection Unit (“FAIU”) in the New York Fire Department. As field inspectors, the plaintiffs perform fire alarm inspections throughout the five boroughs of New York City. Based on a collective bargaining agreement, they are paid to complete a thirty-five hour work week, from 9:00 a.m. to 4:30 p.m. on Monday through Friday, including a half-hour break for lunch.
*365 Field inspections generally take place Monday through Thursday, with each inspector completing approximately five “scheduled” and sixteen “unscheduled” inspections each week. On Friday mornings, inspectors normally report to FAIU headquarters to return completed inspection files for the past week and pick up new inspection files for the coming week. These files generally include documents describing the floor plans and fire alarm history of the buildings to be inspected; various inspection checklists, forms, and reports; and any correspondence between building owners and City agencies. Inspectors are responsible for keeping these documents safe from the time they pick them up on Friday morning until the time they return them on the following Friday. The plaintiffs estimate that the collective weight of these weekly assigned materials is between fifteen and twenty pounds.
The present dispute arises from the City’s requirement that inspectors carry these inspection files without pay in an FAIU-provided briefcase during their commutes from home to work and back. In order to improve efficiency and maximize revenue-generating hours, 1 the City does not permit inspectors to store their documents overnight at FAIU headquarters or to start or end their workday at headquarters. Instead, the City requires inspectors to report directly to their first inspection site at 9:00 a.m. with all necessary inspection materials and to sign out at the end of the day at the closest firehouse. Inspectors who report to inspection sites without the proper inspection files or who fail to keep the inspection files safe during the week are subject to discipline by the FAIU.
The plaintiffs assert that carrying and keeping safe inspection files affects their commutes in various ways and that they should therefore be compensated for their time and effort. For example, Matthews and Shah testified that carrying documents caused them occasionally to miss a bus or train. Patil and Robeny similarly testified that carrying the briefcase slowed down their walk to the subway station. Joseph testified that the briefcase slowed his commute by “give or take” ten minutes, although he admitted it was difficult to specify an exact number. Singh testified that carrying the documents caused him occasionally to miss the subway and that, as a result, he had to plan for twenty or thirty minutes extra time for his commute each way. Singh further testified that he would sometimes take the subway in the opposite direction of where he was heading in order to board a train with fewer people and more space for his briefcase. In addition, several inspectors complained that keeping the documents safe after work hours was inconvenient, preventing them from attending social events because they had to go directly home in order to ensure the safety of the documents. The plaintiffs do not assert that they were assigned any other employment-related tasks during their commutes.
Separately, Singh contends that the City violated his First Amendment rights when it suspended him without pay for thirty days in alleged retaliation for voicing concerns regarding the City’s above-described policy as well as its policy of retaining inspectors in “provisional” status for longer than nine months. Singh complained to various supervisors and fire department officials on several occasions in 2000 and 2001 about the requirement that inspectors *366 transport and safeguard inspection documents, stating his belief that the practice violated the FLSA. Following those complaints, on April 2, 2001, Singh reported to his first inspection site without inspection documents. Henry Gittlitz, then-FAIU manager, informed Singh that his actions were a “dereliction of duty” and cautioned that any repeat behavior would result in administrative charges. In June 2001, Singh wrote on his time sheets that his workday began and ended at home. Deputy Chief Fire Inspector Barrington Brown directed Singh to discontinue this practice and informed him that his behavior could lead to administrative and criminal charges. Singh was later suspended for thirty days without pay on July 13, 2001. The fire department provided Singh with a memorandum detailing the five charges against him on August 6, 2001. This litigation began shortly thereafter.
The district court granted summary judgment in favor of the City on both the FLSA and the First Amendment retaliation claims.
See Singh v. City of New York,
DISCUSSION
On appeal, the plaintiffs argue that the district court erred in concluding: (1) that their commuting time was not compensa-ble under the FLSA; and (2) that Singh’s retaliation claim fails because he did not engage in protected speech on a matter of public concern. This Court reviews a district court’s grant of summary judgment de novo, viewing the facts in the light most favorable to the non-moving party and resolving all factual ambiguities in its favor.
See Buffalo Teachers Fed’n v. Tobe,
I. FLSA Claim
We analyze the plaintiffs’ FLSA claim in two parts: whether the plaintiffs are entitled to compensation for their entire commute because the City requires them to carry inspection documents during their commute; and if not, whether the plaintiffs are entitled to compensation for any addi *367 tional commuting time resulting from the City’s policy.
A. All Commuting Time
The FLSA “guarantee^] compensation for all work or employment engaged in by employees covered by the Act.”
Tenn. Coal, Iron & R.R. Co. v. Muscoda Local No. 123,
Because the activity at issue here occurs outside the scheduled workday, the Portal-to-Portal Act, which amended the FLSA, adds a further obstacle to the plaintiffs’ potential recovery. The Portal-to-Portal Act exempts employers from compensating employees under the FLSA “for or on account of’ time spent “traveling to and from the actual place of performance of the principal activity or activities” of employment and any activities which are “preliminary to or postliminary to said principal activity or activities.” 29 U.S.C. § 254(a). The Supreme Court has interpreted this provision to mean that “any activity that is ‘integral and indispensable’ to a ‘principal activity’ is itself a ‘principal activity.’ ”
IBP, Inc. v. Alvarez,
In short, in order for the plaintiffs to prevail under the FLSA, as amended by the Portal-to-Portal Act, they must demonstrate that carrying inspection documents during a commute: (1) constitutes work under the FLSA and (2) is an integral and indispensable part of their inspecting duties. For the reasons explained below, we conclude that the mere carrying of a briefcase without any other active employment-related responsibilities does not transform the plaintiffs’ entire commute into work. 3
*368
As noted earlier, whether an employee’s expenditure of time is considered work under the FLSA turns in part on whether that time is spent predominantly for the benefit of the employer or the employee. Although we have not previously applied the predominant benefit standard to commuting time, we find useful guidance from FLSA cases applying this test in other contexts. For example, courts frequently apply the predominant benefit standard in the context of employee break time, where employees have sought compensation for their breaks because, though relieved from normal duties, they remain responsible for certain employment-related functions.
4
In these cases, courts have distinguished between employer requirements that substantially hinder an employee’s ability to use the time freely and those requirements that place only a minimal burden on the employee’s use of time. Thus, in
Reich v. Southern New England Telecommunications Corp.,
Importantly, we distinguished those circumstances from several cases decided by other circuits where employees, though retaining some employment duties, were significantly less burdened such that the break time remained predominantly for the employees’ benefit.
Id.
at 66. For example, in
Hill v. United States,
This case is significantly more similar to these latter cases than to Southern New England Telecommunications. Carrying a briefcase during a commute presents only a minimal burden on the inspectors, permitting them freely to use them commuting time as they otherwise would have without the briefcase. Whether it be reading, listening to music, eating, running errands, or whatever else the plaintiffs choose to do, their use of the commuting time is materially unaltered. While the City certainly benefits from the plaintiffs’ carrying these materials, it cannot be said *369 that the City is the predominant beneficiary of this time.
We acknowledge that the constraints of commuting may limit an employee’s ability to use commuting time as freely as in other contexts, such as during a break. But those constraints, which are normal incidents of employment, see 29 C.F.R. § 785.35, should not factor into the predominant benefit test, just as the constraints of a remote work site should not factor into the test for a worker who cannot use his break time as freely as he could with a more convenient work site. In the commuting context, we believe that the appropriate application of the predominant benefit test is whether an employer’s restrictions hinder the employees’ ability to use their commuting time as they otherwise would have had there been no work-related restrictions. Based on this test, we conclude that the mere carrying of inspection documents does not transform plaintiffs’ otherwise non-compensable commute into compensable time. 5
Although we reach our holding based on the predominant benefit test, our analysis in many ways resembles a
de minimis
test. In an analogous case, the Sixth Circuit held that police officers need not be compensated for their entire commuting time, during which they were required to monitor police radios in order to respond to emergencies, because “the amount of work involved in monitoring a police radio during a commute is simply de minimis.”
Aiken,
In deciding this case, we note the practical consequences of the plaintiffs’ challenge. Ruling in their favor could have a wide-ranging impact, suddenly imposing upon businesses across the country a liability to compensate employees anytime those employees must commute to work with important documents, tools, or communications devices. 6 In the sixty years *370 following the Portal-to-Portal Act, we are unaware of any court that has required employers to pay employees for otherwise non-compensable commuting time simply because employees must travel with a briefcase or a small toolbox or a handheld device in order to be prepared for the workday. We are not convinced that the facts in this case warrant such groundbreaking law.
In sum, although the City is pushing the limits on the burdens it may impose on its employees during a commute before it must pay them for such time, we conclude nevertheless that under the circumstances presented in this case, the carrying of a briefcase during a commute without any other employment-related activity does not transform the entire commute into work for purposes of the FLSA.
B. Additional Commuting Time
Our analysis differs with regard to additional commuting time resulting from the City’s policy. Unlike ordinary commuting time, there is no question that any added commuting time is both required by the City and is time spent necessarily and primarily for the benefit of the City.
See Tenn. Coal,
As noted earlier, because such time occurs outside the normal working hours, it is non-compensable under the Portal-to-Portal Act unless carrying inspection materials is an integral and indispensable part of the plaintiffs’ inspecting duties. Because we conclude below that the additional commuting time in this case is de minimis as a matter of law, we do not resolve this issue and instead assume without deciding that carrying inspection documents is an integral and indispensable part of the plaintiffs’ inspecting duties. 7
The
de minimis
doctrine permits employers to disregard, for purposes of the FLSA, otherwise compensable work “[w]hen the matter in issue concerns only a few seconds or minutes of work beyond the scheduled working hours.”
Anderson
*371
v. Mt. Clemens Pottery Co.,
Based on these factors, we conclude that any additional commuting time in this case is de minimis as a matter of law. 8 First, as a practical administrative matter, it would be difficult for the City to record and monitor the additional commuting time for each inspector. The task of creating a reliable system to distinguish between ordinary and additional commuting time for each individual inspector on a daily basis would be challenging, if not impossible. Second, the plaintiffs’ depositions show that the aggregate claims are quite small, generally amounting to only a few minutes on occasional days. 9 Finally, *372 while the plaintiffs carry inspection documents to and from work everyday, several conceded that their commutes are actually only lengthened on those occasional days when they miss a train or bus. Accordingly, we affirm the district court’s judgment that none of the plaintiffs’ commuting time is compensable under the FLSA. 10
II. First Amendment Retaliation Claim
Singh separately asserts that his First Amendment rights were violated when the City suspended him without pay for thirty days in alleged retaliation for voicing concerns regarding the City’s policy of requiring inspectors to carry inspection documents to and from work and its policy of retaining inspectors in “provisional” status for longer than nine months, allegedly in violation of New York Civil Service Law § 65. To establish a First Amendment retaliation claim, a plaintiff must show: (1) his speech addressed a matter of public concern; (2) he suffered an adverse employment action; and (3) a causal connection between the speech and the adverse employment action.
Cioffi v. Averill Park Cent. Sch. Dist. Bd. of Educ.,
Employee expression is not a matter of public concern when it “cannot be fairly considered as relating to any matter of political, social, or other concern to the community.”
Connick v. Myers,
CONCLUSION
For the foregoing reasons, the judgment of the district court is AffiRmed.
Notes
. The City charges the owners or operators of inspected premises $210 per hour for each inspection performed during regular business hours. The City does not charge, however, for time spent by inspectors traveling to inspection sites.
. The district court also analyzed claims for compensation under the FLSA for administrative duties performed outside of normal working hours and for state-law retaliation and freedom of speech violations. Those claims are not on appeal to this Court.
. Our holding does not affect the status of inspectors' travel between inspection sites during normal working hours, which remains fully compensable under the FLSA. See 29 C.F.R. § 785.38 ("Time spent by an employee in travel as part of his principal activity, such as travel from job site to job site during the workday, must be counted as hours worked.”).
. Similarly, the predominant benefit test is often applied in the context of on-call time, where employees have sought compensation for time spent “on call” because their employer restricted their ability to use time freely for their own benefit.
See, e.g., Rutlin v. Prime Succession, Inc.,
. The legislative history of the Employee Commuting Flexibility Act of 1996 ("ECFA”), which amended the Portal-to-Portal Act with regard to the use of employer-provided vehicles, provides further support for our conclusion. The ECFA exempts employers from compensating employees for the use of an employer's vehicle for travel (and for activities incidental to that use) so long as the travel is within the normal commuting area for the employer’s business and the use of the vehicle is subject to an agreement between the employer and the employee (or representative). See 29 U.S.C. § 254(a). Although the ECFA context differs from our case because of the voluntary agreement requirement, the House Report for the ECFA makes clear Congress’s view that "[m]erely transporting tools or supplies should not change the noncom-pensable nature of the travel.” H.R.Rep. No. 104-585, at 5 (1996).
. The plaintiffs here do not seek compensation for the physical exertion of carrying a briefcase. Rather, they believe that the FLSA requires that they be compensated for the entire commute simply for the presence of the documents, including, for example, when the documents are in the trunks of their cars or under their legs on a train. As the plaintiffs contended at oral argument, if instead of being required to carry a briefcase of documents, they were required to carry a small mobile device containing electronic copies of those same documents, the City would still have to compensate them for their commuting time. Such an argument loses sight of the *370 definition of work, which must involve some level of exertion or lost time.
. The "integral and indispensable” standard requires that an activity be both integral (i.e., "necessary”) and indispensable (i.e., "essential to completeness” or "organically joined or linked”) to a principal activity of employment.
Gorman v. Consol. Edison Corp.,
. In
Tum v. Barber Foods, Inc.,
Additionally, the plaintiffs contend that the
de minimis
test is irrelevant here because of the Department of Labor's "continuous workday rule,” which provides that "[pjeriods of time between the commencement of the employee’s first principal activity and the completion of his last principal activity on any workday must be included in the computation of hours worked to the same extent as would be required if the Portal Act had not been enacted.” 29 C.F.R. § 790.6(a);
see also IBP,
. For example, Matthews, Patil, Robeny and Shah testified that carrying the documents slowed down their walk to the bus or subway station, causing them occasionally to miss a bus or train. Joseph testified that his commute was slowed by "give or take” ten minutes, although he admitted it was difficult to specify an exact number. Only Singh made a ■ large aggregate claim, asserting that he had to plan for twenty or thirty minutes extra time *372 for his commute. However, the substantial difference between Singh and the other plaintiffs is the result of Singh’s idiosyncratic behavior—including occasionally boarding trains going in the wrong direction—and thus is not time spent necessarily and primarily for his employer’s benefit.
. We note that the FLSA provides only a floor as to when an employer must compensate employees for their time. The inspectors remain free to contract with the City through the collective bargaining process for additional compensation for their efforts completed while commuting. Given the plaintiffs' ongoing employment with the City, a contractual agreement may yield the most equitable resolution to this dispute.
. Singh's attempt to turn his personal grievance into a matter of public concern through a March 2001 conversation with the Fire Commissioner where he allegedly raised the issue of ''provisional” employees—an issue that he asserts did not concern him as a 'permanent” employee—is unavailing. Singh stated in his affidavit that he was requested to give up his 'permanent” status in 1998 and to accept a "provisional” title and was later advised that unless he agreed to a reduced title, he would not be considered for any promotions. It is in this context that Singh raised his concerns regarding the Civil Service Law with the Commissioner. In addition, Singh was apparently involved in an earlier discrimination lawsuit against the FAIU related to the "provisional” versus "permanent” employee status issue, and he claimed in his deposition that he was continuously being retaliated against because of that suit. As Singh summarized: "These charges *373 are being brought upon as an instrument to harass me and frame wrongly as retaliation to my various attempts to seek justice per my contract, my rights as [a] civil servant and above all my civil rights which are being violated by management."
