Why do jets leave a white trail behind them.

"Bob Moore" wrote\

I don't know about the Malibu, but the large jet transports that I
have flown, B-707, B-727, certainly did not have heated fuel tanks.
Yep, the fuel filters had a heating capability using bleed air from
the engine compressors.....flightcrew controlled. At higher Mach
numbers (.80+), the temperature ram rise at the wing leading edge
kept the fuel from waxing under most circumstances.

Humm, that surprises me. Do they have excess fuel returned to the tank,
which could carry some heat with it?

No worries with the Malibu, since the Mach numbers will keep things nice and
toasty. g
--
Jim in NC