MetroJet operations did not improve US Airways's loss-making record. Many of MetroJet's passengers were cannibalized from other US Airways operations, such as its major presence at Ronald Reagan Washington National Airport. Its aircraft were among the oldest and least fuel efficient in US Airways's fleet, and like its parent its labor costs were among the highest in the industry. Meanwhile, it faced cutthroat competition with Southwest, its main competitor at BWI. In an October 28, 2001 interview with Business Travel News, CEO David Siegel revealed that MetroJet's average cost per available seat mile was 8 cents, compared to 6 cents for Southwest and 10 cents for mainline US Airways.
The September 11, 2001 attacks gave US Airways a rationale to invoke a force majeure clause in its labor contracts to close the operation, announced on September 24. It represented, too, US Airways's surrender of Baltimore-Washington International Thurgood Marshall Airport as a hub, which it had inherited from an earlier merger with Piedmont Airlines. Once the largest carrier there, its number of scheduled flights had fallen by 60 percent by the time the last MetroJet 737 was retired in December.