I'm sorry if this is in the wrong forum or is repetitive.

Given the very high altitude of MEX (about 7,300' above sea level, IIRC), are outbound flights often payload restricted? For example, UA flies A320s from there to ORD and IAD, and CO flies 737s from MEX to EWR. All three of those routes are over 2,000 statute miles, which would normally not be a problem at all, especially going eastbound. But does MEX's very high altitude make those flights problematic with high payloads?

Thanks.