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Message: <blockquote data-quote="MacInWin" data-source="post: 1787857" data-attributes="member: 396914"><p>Patrick, it's not so much temperature alone, as it is a combination of temperature, air pressure, weight of the aircraft and a couple of other factors. When it gets hot, air gets thinner. Add a low pressure naturally and on a hot day it can get pretty thin. Thin air is less thrust from the engines and less lift on the wings. Now add a full flight, full bag of fuel and on a hot, low-pressure day there may not be enough thrust or lift to take off safely.  I once watched a Navy A-3 take off from Stapleton, in Denver, in the middle of summer. It barely cleared the fence of the base, then descended again on the other side and just scooted across the ground. I think it eventually gained altitude because the earth is round and fell away from it.</p></blockquote><p></p>