I'm so tired of AA purposely lying about on-time departures. Am on 2386 today. Inbound from MEX is delayed with estimated arrival 35 minutes before 2386 departure. No way for 2386 to depart on-time with an inbound int'l arrival that requires a security sweep. The agents at the admirals club said this keeps happening and it's frustrating everyone. Why has AA ops become so terrible on very basic things? Fix it.