DALLAS (AP) — The pilots union at American Airlines says there has been “a significant spike” in safety issues at the airline, including fewer routine aircraft inspections and shorter test flights on planes returning from major maintenance work.

The union also says it has seen incidents in which tools were left in wheel wells and items were left in the sterile area around planes parked at airport gates.

A spokesman said Monday that union officials have raised their concerns with senior managers at the airline and were encouraged by the company’s response.

American, which is based in Fort Worth, Texas, did not immediately comment on the matter.

The safety committee of the Allied Pilots Association said in an email to members Saturday that the union “has been tracking a significant spike in safety- and maintenance-related problems in our operation.”