SUMMARY ORDER

The Supplement B Pilot Beneficiaries (“Supp. B Pilots”) appeal from three judg- *65 merits of the District Court, which in turn affirmed three orders of the Bankruptcy Court for the Southern District of New York (Sean H. Lane, Bankruptcy Judge). The underlying Bankruptcy Court orders (1) granted the debtor’s motion to reject a collective bargaining agreement (“CBA”) with its phots, (2) eliminated the Supp. B Pilots’ option for lump-sum payouts at retirement, and (3) extinguished grievances filed pursuant to the rejected CBA. We assume the parties’ familiarity with the facts and record of the prior proceedings, to which we refer only as necessary to explain our decision to affirm.

In their appeal, the Supp. B Pilots make four principal arguments, all of which we reject.

First, the Supp. B Pilots argue that the Bankruptcy Court’s rejection of the CBA violated both 11 U.S.C. § 1113, whicfy they claim required good faith negotiation with the Supp. B Pilots, and their rights under the CBA. But the debtor complied with § 1113, which only requires the debtor to negotiate with the “authorized representative” of the employees (here, indisputably, the union), not with subgroups of members represented by the union, such as the Supp. B Pilots. Nor was there a violation of the Supp. B. Pilot’s rights under the CBA: having permissibly rejected the CBA under § 1113, the debtor was no longer required to comply with its terms. The Supp. B Pilots also argue that, in any event, they qualify as “interested parties” whose objections to an application for rejection of a CBA must “be heard” under 11 U.S.C. § 1113(d)(1). We do not need to decide that issue because the Bankruptcy Court did in fact permit the Supp. B Pilots to appear and be heard, and rejected their arguments on the merits.

Second, the Supp. B Pilots argue that the Bankruptcy Court committed error in eliminating an option for lump-sum retirement benefits that was guaranteed in perpetuity by the CBA, and committed clear error in finding that the elimination of lump-sum benefits was necessary to avoid a failure of the retirement plan post-bankruptcy. However, as noted, the CBA was properly rejected, and the Bankruptcy Court’s factual finding was supported by the record, including statistics showing that a lump-sum option was associated with higher retirement rates and thus likely to cause financial strain on the already underfunded retirement plan.

Third, the Supp. B Pilots argue that the Bankruptcy Court erred in extinguishing their grievances filed under the rejected CBA — grievances that challenged the Bankruptcy Court’s authority to conduct the bankruptcy proceeding by abrogating the CBA and eliminating the lump-sum retirement benefit option. Under the circumstances, the Bankruptcy Court’s decision to extinguish these grievances was not error. To the contrary, the decision was necessary to allow the court to conduct core bankruptcy proceedings and fell within its equitable power to “issue any order ... necessary or appropriate to carry out the provisions of [the Bankruptcy Code].” 11 U.S.C. § 105(a).

Fourth, the Supp. B Pilots point out that all disputes growing out of grievances or relating to interpretations of the CBA were subject to mandatory arbitration under the Railway Labor Act, 45 U.S.C. § 151 et seq. (the “RLA”). In light of the CBA’s arbitration requirement, they argue, the Bankruptcy Court lacked jurisdiction to decide CBA-related issues like the rejection of the CBA or the extinguishment of claims against the debtor based on grievances filed under the CBA. We conclude that whether the CBA or grievances filed under the CBA could be rejected in bankruptcy were issues to be resolved under the Bankruptcy Code and not under *66 the CBA or the RLA. The Bankruptcy Court- did not exceed its jurisdiction in deciding them.

We have considered all of the Supp. B Pilots’ remaining arguments and conclude that they are without merit. For the foregoing reasons, the judgments of the District Court are AFFIRMED.