[bongodriver]

Conditions are everything in aircraft performance. That fact is very much on your mind when piloting a real aircraft.

Every take off you calculate V1,V2, Vmcg, Vr, BFL and as well as acceleration checks. All are effected by density altitude.

Rubbish, real pilots only have to calculate how much rest they earn at the end of the duty period and pray they don't end up on a split-shift, I pitty the poor guy that has to go into the Flight Manual and work this stuff out instead of having it ready in tabular abridged form on the checklists based on T/O weight and temparature or in fact have the entire performance schedule handed to him by operations who worked it out for him, occasionally with GA operations there are times when you will dust off the Flight Manual if a customer has an unusual destination.

you failed to notice nobody argued 'against' the density altitude but you did go on and on and on about it like it was a 'eureka' moment.

Now that the atmospheric conditions are known, conclusions can be made about specific aircraft performance.

You're welcome.