An American Airlines Boeing 737.CHARLY TRIBALLEAU/AFP via Getty ImagesThe Allied Pilots Association says safety problems are increasing at American Airlines.It said incidents include tools left in wheel wells and increased collisions between towed planes.United Airlines has faced increased oversight from regulators, which American will want to avoid.The union for American Airlines pilots has warned that safety problems are increasing at the carrier.In a Saturday statement, the Allied Pilots Association said it "has been tracking a significant spike in safety- and maintenance-related problems in our operation."It listed incidents like tools being left in wheel wells, and more collisions between towed or tugged aircraft.The APA also said some maintenance actions hadn't been closed out properly, and there were increased intervals between inspections."Remember: Don't rush, don't be intimidated, and don't be pressured into doing something that doesn't pass the 'smell test,'" the union told pilots.