The US Airline Pilots Association (USAPA) was the collective bargaining agent for the majority former US Airways "East" pilots, and the minority former America West Airlines "West" pilots. USAPA was led by East pilot Mike Cleary. USAPA was formed by East pilots for the exclusive and purpose of attempting to overturn the results of the previous pilot seniority integration arbitration. During the fair representation trial, USAPA used as courtroom witnesses East pilots Chesley Sullenberger and Jeffrey Skiles of the famous Hudson River flight 1549. Both witnesses testified in support of USAPA.