A recent ruling in the American Airlines bankruptcy case enforcing an automatic acceleration upon bankruptcy provision serves as a reminder that the enforceability of so-called ipso facto provisions in debt instruments remains an unsettled, forum-dependent question.      

The absolute priority rule of Section 1129(b) of the Bankruptcy Code is a fundamental creditor protection in a Chapter 11 bankruptcy case. In general terms, the rule provides that if a class of unsecured creditors rejects a debtor’s reorganization plan and is not paid in full, junior creditors and equity interestholders may not receive or retain any property under the plan. The rule thus implements the general state-law principle that creditors are entitled to payment before shareholders, unless creditors agree to a different result.