Affirmed by published opinion. Judge WILKINSON wrote the opinion, in which Judge MOTZ and Judge FLANAGAN joined.
*445 OPINION
In August 2002, U.S. Airways filed for bankruptcy. In order to secure the financing necessary to emerge from bankruptcy, U.S. Airways was forced to terminate the pension plans it administered for its active and retired pilots. A bankruptcy court approved this termination, and this court eventually held that a claim to reverse the termination was equitably moot. In September 2004, U.S. Airways again filed for bankruptcy. A year later, U.S. Airways emerged from this second bankruptcy with a second plan of reorganization.
Six months after U.S. Airways’s emergence from its second bankruptcy, Edwin Perrow Bosiger, Jr., brought suit in federal district court contending that U.S. Airways had improperly terminated his pension during its first bankruptcy. The district court dismissed Bosiger’s claim, holding that it was barred because Bosiger failed to file a proof of claim during U.S. Airways’s second bankruptcy. After careful consideration, we agree with the district court and affirm its decision. It is simply too late in the day for Bosiger to challenge the termination of his pension: unwinding U.S. Airways’s second bankruptcy at this stage would not only unduly lengthen the airline’s restructuring, but it would also upset the legitimate interests of those creditors who relied on U.S. Airways’s reorganization plan.
I.
A.
In the mid-1990s, U.S. Airways Group, Inc. (“US Airways”), and the Air Line Pilots Association (“ALPA”), an international union representing U.S. Airways’s active pilots, reached an agreement on retirement benefits. This agreement called for retired pilots to receive, on a monthly basis, a share of their final salary adjusted for the length of their tenure with U.S. Airways.
In order to provide these monthly benefits, U.S. Airways established a pension plan referred to as the Non-Qualified Top Hat Retirement Plan (“Non-Qualified Plan”). The Non-Qualified Plan supplemented the pre-existing Retirement Income Plan for Pilots of U.S. Airways (“Pilots Defined Benefit Plan”). The Pilots Defined Benefit Plan was a tax-qualified pension plan capped by the Internal Revenue Code, such that it alone could not provide the total retirement benefits promised to U.S. Airways’s pilots under the agreement with ALPA.
The Non-Qualified Plan, on the other hand, paid retirement benefits above and beyond those payable by the Pilots Defined Benefit Plan. Although never memorialized in a written contract, the Non-Qualified Plan was maintained pursuant to the original collective bargaining agreement and subsequent letters of agreement between U.S. Airways and ALPA. These letters recognized that the Non-Qualified Plan was necessary “to pay benefits which cannot be paid from the [Pilots Defined Benefit Plan] due to [limitations imposed by the] Internal Revenue Code.”
On August 11, 2002, U.S. Airways filed for Chapter 11 bankruptcy. 1 In order to continue its operations during its reorganization and successfully emerge from Chapter 11, U.S. Airways needed almost $1.75 billion in financing. US Airways was able to assemble a syndicate of lenders willing to provide this amount, but the lenders were only willing to extend the credit if *446 U.S. Airways was able to meet certain financial targets.
A major threat to U.S. Airways’s ability to access the loans was an escalating pension funding problem, particularly with respect to its pilots, who accounted for a substantial portion of U.S. Airways’s outstanding pension obligations. At the same time passenger revenues had dropped precipitously in the wake of the September 11th terrorist attacks, lower interest rates and a poor stock market had greatly decreased the performance of U.S. Airways’s defined benefit pension plans, increasing the airline’s projected contribution to the plans. This left U.S. Airways with insufficient cash flow to both meet its pension obligations and achieve the financial targets necessary to access the required funding. After exploring various potential solutions to this problem, U.S. Airways determined that, so long as its pilot pension plans were in place, it would be unable to secure the financing it needed to emerge from Chapter 11.
US Airways thus sought to restructure its pilot pension obligations, with its ultimate goal being the termination of the two existing pension plans (Pilots Defined Benefit Plan and Non-Qualified Plan) and their replacement with a defined contribution plan. To do so, U.S. Airways petitioned the bankruptcy court to allow a “distress termination” of its Pilots Defined Benefit Plan under the Employee Retirement Income Security Act (“ERISA”), 29 U.S.C. § 1341(c)(2)(B)(ii)(IV) (2000). US Airways did not specifically request the “distress termination” of the Non-Qualified Plan because it was under the belief that the Non-Qualified Plan was a “top hat” plan, terminable simply pursuant to an express agreement between U.S. Airways and ALPA approved by the bankruptcy court.
In March 2003, the bankruptcy court ruled that U.S. Airways satisfied ERISA’s standards for distress termination. The court therefore allowed U.S. Airways to terminate the Pilots Defined Benefit Plan, subject to a determination that the proposed termination did not violate the collective bargaining agreement with ALPA. U.S. Airways and ALPA subsequently issued Letter of Agreement # 85, which approved the termination of both pilot pension plans. The letter stated that the Pilots Defined Benefit Plan “will be terminated ... and merged into” a new defined contribution plan available only to active and non-retired pilots, while “the [Non-Qualified Plan] will be terminated, and payments will permanently cease, effective March 31, 2003.”
In light of this letter, the bankruptcy court authorized U.S. Airways’s “distress termination.” At about the same time, the bankruptcy court also approved U.S. Airways’s reorganization plan, one part of which stated that all retirement plans sponsored by U.S. Airways “will continue in effect except, to the extent terminated in accordance with applicable law, the Retirement Income Plan for Pilots of U.S. Airways, Inc. and related (non-qualified) Top Hat Plan.” Finally, on March 31, 2003, U.S. Airways emerged from bankruptcy, stopped paying benefits on the old Pilots Defined Benefit and Non-Qualified Plans, and started contributing to the new defined contribution plan for non-retired pilots. At this point, retired pilots began to receive benefits from the Pension Benefit Guaranty Corporation, which had guaranteed the Pilots Defined Benefit Plan.
As U.S. Airways emerged from bankruptcy, U.S. Airways’s retired pilots appealed the district court’s distress termination decision, seeking to have their old pension benefits restored. But since the retired pilots had neglected to have the termination and reorganization orders stayed, and since the orders had been
*447
implemented and relied on by third parties, the district court held that the suit was equitably moot. This court affirmed on the same grounds in
In re U.S. Airways Group, Inc.,
In September 2004, U.S. Airways again filed for bankruptcy. A year later, in September 2005, U.S. Airways emerged from its second bankruptcy with a new plan of reorganization.
B.
Petitioner Edwin Perrow Bosiger, Jr., is a retired U.S. Airways pilot who, before U.S. Airways’s first bankruptcy, had received benefits from both the Pilots Defined Benefit Plan and the Non-Qualified Plan. During U.S. Airways’s second bankruptcy, U.S. Airways notified Bosiger by letter of (1) the Chapter 11 filing date and the bar date for filing general unsecured claims and (2) entry of the order confirming the second Plan of Reorganization, the effective date of the Plan of Reorganization, and the bar date for filing certain administrative and rejection damage claims. Though provided with these two notices, Bosiger did not file a claim during the second bankruptcy.
Bosiger instead chose to bring suit against U.S. Airways six months later, filing a complaint in the United States District Court for the Eastern District of Virginia on March 27, 2006. Bosiger argued that U.S. Airways had improperly terminated the Non-Qualified Plan during its first bankruptcy because the Non-Qualified Plan was a “top hat” plan in name only, and therefore not terminable merely through express agreement between U.S. Airways and ALPA. Bosiger therefore contended that he was still entitled to his benefits under the Non-Qualified Plan.
US Airways responded by filing a Rule 12(b)(6) motion, alleging that Bosiger’s complaint failed to state a claim for various reasons. Most relevant to this appeal, U.S. Airways argued that, even if the termination of the Non-Qualified Plan was unlawful, Bosiger had waived any right to challenge the termination of the Plan by failing to file a proof of claim during U.S. Airways’s second bankruptcy.
In September 2006, after considering Bosiger’s reply to U.S. Airways’s motion to dismiss and argument at a hearing on the matter, the district court granted U.S. Airways’s motion. The district court articulated two grounds for its holding. First, the court stated that U.S. Airways appropriately considered the Non-Qualifed Plan to be a “top hat” plan. Thus, U.S. Airways had properly terminated the Plan during its first bankruptcy, pursuant to its Letter of Agreement # 85 with ALPA and the bankruptcy court’s approval of U.S. Airways’s reorganization plan.
Second, and in the alternative, the district court held that Bosiger’s “claim is barred because he failed to file a proof of claim during U.S. Airways’s second bankruptcy.” The court reasoned that, to the extent Bosiger had a valid claim after the Non-Qualified Plan was terminated on March 31, 2003, he became a creditor when U.S. Airways entered Chapter 11 a second time in September 2004. Thus, Bosiger was required to file a proof of claim during the second bankruptcy proceeding; his failure to do so led to his claims being discharged along with the rest of U.S. Airways’s debts when U.S. Airways emerged from bankruptcy a second time in September 2005.
Bosiger now appeals the district court’s order dismissing his complaint, arguing that each of the court’s alternate grounds for its holding constituted error. In particular, Bosiger challenges the court’s finding that the Non-Qualifed Plan was a “top hat” plan, and argues that his failure to file a proof of claim during U.S. Airways’s *448 second bankruptcy should not bar his present suit.
II.
We review Bosiger’s appeal from the district court’s Rule 12(b)(6) dismissal
de novo, Smith v. Sydnor,
As the district court stated, when Bosiger failed to file a proof of claim during U.S. Airways’s second bankruptcy, any potential claim he had to payments under the Non-Qualified Plan was extinguished. One of the primary purposes of bankruptcy is the discharge of debts, and the Bankruptcy Code and Rules explicitly state — in several places — that all of a debtor’s preexisting obligations terminate upon the debtor’s emergence from bankruptcy. Bo-siger does not contest the fact that he failed to file a claim. Instead, he argues that he was not on proper notice of U.S. Airways’s second bankruptcy, and it was therefore improper for the district court to dismiss his claim. We find, however, that the district court did not err in determining that Bosiger had received adequate notice and properly dismissed Bosiger’s suit on these grounds.
A.
The “principal purpose” of bankruptcy is straightforward: “to grant a ‘fresh start’ to the ‘honest but unfortunate debtor.’ ”
Marrama v. Citizens Bank of Massachusetts,
— U.S. -,
Several provisions of the Federal Rules of Bankruptcy Procedure and the Bankruptcy Code work in unison to ensure that debtors receive a “fresh start” after emerging from bankruptcy. First, Bankruptcy Rule 3003(c) requires that “claimants against an estate in bankruptcy ... file timely proofs of claim in order to participate in a reorganization.”
Chemetron Corp. v. Jones,
In light of the directives of the Bankruptcy Code and Rules, it is clear that Bosiger’s claim for payment under the Non-Qualified Plan is foreclosed by U.S. Airways’s second bankruptcy. If U.S. Airways improperly terminated the Non-Qualified Plan during its first bankruptcy, as Bosiger alleges, Bosiger’s injury made him an unsecured creditor of U.S. Airways, and therefore the holder of a “claim” within the meaning of 11 U.S.C. § 101(5)(A), during the second bankruptcy. As the holder of a bankruptcy “claim,” Bosiger was required, under Fed. R. Bankr.P. 3003(c)(3), to file a proof of that claim with the bankruptcy court before the bar date in order to participate in U.S. Airways’s reorganization. He did not do so, and thus, as the bankruptcy court recognized in its Bar Date Order, U.S. Airways was “forever discharged from any and all indebtedness or liability with respect to” any claims not brought to the court’s attention.
Although this alone is sufficient to foreclose Bosiger’s claim, the bankruptcy court’s confirmation of U.S. Airways’s second Plan of Reorganization offers further proof that Bosiger’s claim is barred. In its Confirmation Order, the bankruptcy court explicitly cited 11 U.S.C. § 1141(d) and stated that U.S. Airways’s emergence from bankruptcy served to extinguish all preexisting “Claims and Causes of Action, whether known or unknown.” Moreover, the Confirmation Order mirrors 11 U.S.C. § 524(a)(2) in further noting that the discharge of U.S. Airways’s debts serves to enjoin “any Person” from “commencing or continuing any action ... to collect, offset, or recover any Claim ... discharged under this Plan.” It is thus clear that U.S. Airways’s second bankruptcy discharged any claim Bosiger had to payment under the Non-Qualified Plan.
The bankruptcy court in this case — and the Bankruptcy Code and Rules in general — both recognize the dramatic consequences that would result if Bosiger were able to circumvent U.S. Airways’s bankruptcy proceedings. To begin, allowing individual creditors to opt out of a formal bankruptcy proceeding in order to bring a subsequent civil lawsuit against a debtor only serves to make bankruptcy proceedings more complex and more costly. Such an outcome directly contradicts the Supreme Court’s teaching that the prompt and efficient administration and settlement of a debtor’s estate is a principal goal of bankruptcy law.
Katchen v. Landy,
More importantly, unwinding the finality of bankruptcy upsets not only the expectations of the creditors who actually do participate in the bankruptcy proceedings, but also the reliance interests of the creditors who have advanced funds based on the new capital structure laid out in the reorganization plan.
See In re U.S. Airways Group, Inc.,
B.
It would be difficult for any claimant to challenge directly the critical role played by finality in the bankruptcy process. Instead, Bosiger simply contests the district court’s conclusion that he was on notice of U.S. Airways’s second bankruptcy. Since notice consistent with the Due Process Clause is a prerequisite for the discharge of a creditor’s debts in bankruptcy, Bosiger argues that it was improper to dismiss his claim if he did not receive constitutionally adequate notice.
Bosiger’s argument proceeds as follows. First, Bosiger notes that a court is not to consider matters outside the pleadings or resolve factual disputes when ruling on a motion to dismiss.
See, e.g., Edwards v. City of Goldsboro,
1.
It is well settled that district courts may convert a Rule 12(b)(6) motion to dismiss into a Rule 56 motion for summary judgment, allowing them to assess whether genuine issues of material fact do indeed exist. See,
e.g., George v. Kay,
In this case, we find that the district court’s consideration of matters outside the pleadings did convert U.S. Airways’s Rule 12(b)(6) motion into a Rule 56 motion for summary judgment. Both parties had ample opportunity to present material relevant to the question of notice. US Airways submitted extensive briefing along with its motion to dismiss, and Bo-siger did likewise in his opposition to that motion. The district court considered this briefing, and also held, on July 7, 2006, a *451 hearing on the motions at which both sides presented argument. Furthermore, both parties presented facts relevant to the question of notice in their briefing to this court.
Given the development of the record on the question of notice, we feel confident that we can apply the summary judgment standard in this case. We thus reject Bosiger’s contention that the procedural posture of this case makes his general denial sufficient to resolve the question of notice. Indeed, to rule otherwise would promote the very circumvention of the bankruptcy process through subsequent civil actions that the Bankruptcy Code and Rules were designed to prevent.
2.
The district court did not err in concluding that Bosiger received adequate notice in this case. US Airways presented substantial evidence that it provided constitutionally sufficient notice to Bosiger that his claim to payment under the Non-Qualified Plan was in danger of being discharged. Bosiger does not effectively rebut this evidence.
See Celotex Corp. v. Catrett,
On the general need for notice, there is little dispute. A pre-existing debt can be discharged through bankruptcy only if the creditor was on notice of a debtor’s bankruptcy filing and the claims bar date. In
Mullane v. Central Hanover Bank & Trust Co.,
Courts have interpreted the
Mul-lane
standard flexibly in the bankruptcy context, measuring the adequacy of notice against the certainty of a creditor’s claims.
See Mullane,
While the flexibility of the Mullane standard can make it difficult, in certain cases, to determine if a creditor received proper notice in a bankruptcy proceeding, it does not do so in this case. This is because Bosiger clearly received notice sufficient to meet the requirements of *452 Múlleme given the circumstances of his case. During U.S. Airways’s second bankruptcy, Bosiger was sent two timely letters: the first, sent on October 15, 2004, notified him of the Chapter 11 filing date and the bar date for filing general unsecured claims, see In re U.S. Airways, Inc., Case No. 04-13819-SSM (Bankr.E.D.Va.) (Docket #571), and the second, sent on October 4, 2005, notified him of the entry of the order confirming the second Plan of Reorganization, the effective date of the Plan of Reorganization, and the bar date for filing certain administrative and rejection damage claims, see id. (Docket # 3301). These letters are sufficient to establish that Bosiger received actual notice of U.S. Airways’s second bankruptcy, to say nothing of the fact that, as the district court pointed out, U.S. Airways’s bankruptcy was very well-publicized and that Bosiger, as a retired U.S. Airways pilot, could be expected to possess more than a passing interest in those proceedings.
Furthermore, the very event that prompted Bosiger to bring this suit — the termination of his payments under the Non-Qualified Plan — occurred almost 18 months before U.S. Airways declared bankruptcy for the second time and nearly three years before Bosiger brought suit in district court. The termination of payments could reasonably be expected to place a recipient or beneficiary such as Bosiger on the alert. Moreover, the termination of U.S. Airways’s pilot pension plans was already the subject of a lengthy litigation, ultimately resolved by this court, between U.S. Airways and its retired pilots.
See In re U.S. Airways Group, Inc.,
The primary evidence Bosiger offers to rebut the foregoing is his own deposition testimony that he cannot “recall receiving any notice of the second bankruptcy.” This general denial is insufficient to overcome the substantial evidence indicating that Bosiger received adequate notice. To begin, we must presume, absent strong evidence to the contrary, that Bo-siger received the letters of notice mailed to him.
FDIC v. Schaffer,
Bosiger’s general denial does not constitute the strong evidence needed to overcome the presumption of receipt. 2 If we *453 were to hold that Bosiger’s general denial was sufficient, it would make it discernibly more difficult for any court to grant summary judgment in any case where proper notice is required. The result would be to prolong and undercut the bankruptcy process by civil actions on the part of creditors who failed to pursue their claims when it was timely and appropriate for them to do so. The district court was right to recognize this danger, and its decision is
AFFIRMED.
Notes
. This court considered an earlier dispute arising from U.S. Airways's first bankruptcy in
In re U.S. Airways Group, Inc.,
. At the July 7, 2006 motions hearing to discuss U.S. Airways's motion to dismiss, Bosiger's counsel indicated that the two letters providing notice of U.S. Airways's bankruptcy may have been mailed to the wrong address. Bosiger's counsel mentioned that the notice letters were mailed to the Florida address of an “Ed Bosiger,” and Bosiger’s counsel represented that Edwin Bosiger, Jr., who is the Plaintiff-Petitioner in this case, resides in Virginia. However, Bosiger's counsel admitted during the hearing that he had not spoken to his client on this point, and that he was there *453 fore unable to confirm whether the letters had, in fact, been erroneously mailed to the wrong location.
Bosiger did not reiterate this argument in his briefing before this court. Bosiger’s counsel did, however, under direct questioning at oral argument, state that she "believed” that Bosiger lived in Virginia when the notice was mailed to Florida. US Airways's counsel noted that Bosiger testified during a deposition that he lived in the residence in Florida in 2004 (when the first notice was mailed), and that he still owned the Florida residence as of 2006.
Given the tentative nature of the claims put forward by Bosiger’s counsel, we accord little weight to the argument that Bosiger's notice was mailed to the wrong address. At the very least, the speculative nature of the claims demonstrate that they do not offer sufficient evidence that Bosiger did not receive his notice letters.