EdwardS, if your A\T set to maintain speed, then as you burn fuel, aircraft become lighter, and require less power to maintain speed, so A\T will throttle back a little. A never flew plane with A\T, so i cant tell if it is correct for FSX, but it should do that i think.

Lou, could you be more specific on how engines are controlled in 727s and 707s? Those throttle levers in cabin adjusts what? and how engine know how much fuel it'll need for currrent altitude and set power?
i mean if fly DC-3, then i should manually adjust mixture. who adjust it in jets?

Thank you.