Hot conditions or high conditions or hot & high conditions affects all aircraft types similarly, however the more retricted the performance of your aircraft at sea level, the more it will show up with altitude and/or temperature.
I cannot think of any circumstance where an Airbus would gain a performance benefit that would not similarly improve the Boeing’s performance.
Mixtec, is Quito’s elevation above 8400′? If so and American 757’s are operating into there they must be under a relaxed set of limitations compared to JAA rules. This is not impossible as the FAA allows their 757’s to do Mach 0.86 at high level and 370 knots at low level whereas the JAA only allow Mach 0.84 and 350 knots. There is no difference between the airframes as our 757’s that operate with Ryan in the winter can do the higher speeds in the US but must slow down in the UK!
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