Comments on yesterday's post remind me of this story. I can't remember if it's a joke or a real story someone told me, but it goes like this.
A fairly new pilot has flown his rented flying school airplane into a high altitude field on a hot day. He's very conscious of the responsibility he has to be aware of the performance penalties involved and is walking around on the ramp admiring some of the other airplanes. There's a nice little Piper being with the doors open and he sees the fuel truck arrive and fill the tanks while the pilot and large adult passengers pile baggage in the back. He takes an opportunity when the passengers are busy photographing themselves in front of the airplane to ask, "How can you load the airplane like that on such a hot day?"
"Oh, it's okay," the pilot says proudly. "We have air conditioning."