WASHINGTON (USA Today) - American Airlines’ pilots union is warning that it’s been tracking a “significant spike” in safety and maintenance issues at the airline.

In a memo to its members that USA TODAY reviewed, the Allied Pilots Association’s Safety Committee said it was seeing a trend of tools left in wheel wells after maintenance work was performed, an increase in aircraft collisions on the ground during towing operations, poor recordkeeping and abbreviated check flights after maintenance, among other issues.

“While United Airlines is currently under public and government scrutiny, it could just as easily be American Airlines,” the memo said. The union also said airline employees appear to be under pressure to return aircraft to service in an effort to maintain flight schedules.

In a separate letter to the union’s members that USA TODAY reviewed, APA President Ed Sicher said union representatives have met with American’s management team to address their concerns.