On March 19, 2021, the United States Court of Appeals for the Third Circuit issued a unanimous decision[1] affirming that the mutuality requirement of section 553(a) of the Bankruptcy Code must be strictly construed and, therefore, that triangular setoffs are not permissible in bankruptcy.

On 13th August 2013, the US Department of Justice (DOJ) and attorneys general from six US states and the District of Columbia filed suit in the US District Court for the District of Columbia to block the merger between US Airways and American Airlines. Days before, a group of American Airlines customers filed a claim that the merger would violate Section 7 of the Clayton Act.