Well, DLX, the indeniable laws in the physics of combustion will equatorially state that heat has an adverse effect on a turbofan's performance. IT's rather obtuse of you to say that an aircraft never 'struggles' off the ground. Last Thursday, I was returning to MKE via ORD from SNA on N628AA. The aircraft was oversold, had 2 pallets of cargo, a full pax load and was scheduled for meal service. Ambient ground temperature was around 102. As you know, SNA has noise-abatement procedures that are as strict, complex, and quizzical as DCAs are. As usual, the capt. announced over the PA of his intentions of holding the aircraft at full thrust, releasing, a steep ascent, sharp throttle cut-back, half of a split-S curve, dive of 1,000', and return to normal ascent. Other than having used up around 6600' of the aircraft, the plan wasn't followed as it usually was. Normally, AA simply because of the noise abatement, they will NEVER oversell an aircraft leaving SNA, let alone add cargo. In the 32x I've flown on that route, 8x on that particular aircraft, never have we had a takeoff like the aforementioned. We weren't able to take advantage of a rapid ascent, and at full throttle, 400' above the houses on Arcadian avenue, you could see the sunbathers telling us that American was no. 1 with the finger between their index and ring. So, an aircraft can struggle. And, heat has an adverse effect. Heat can either be extremely dry (MEX, PHX, DEN), or humid (BKK, PHK, MIA).
I mean, for the right price I’ll fight a lion. - Mike Tyson