FakePilot :
>Consider: A 737 with 2 engines produces max 50K thrust. But it
>can lift and hold some 130K pounds. So in this case, you get >80K pounds for "free."
This time, a reply without sarcasm.
Forces are vector : they have both magnitude AND direction. Generally, Thrust and Weight act at right angles to one another, and thus do not interact.
I refer you to the Lift/Thrust/Drag/Weight diagram at:
How Planes Fly For steady, level flight you just need Thrust = Drag, and Weight = Lift. There's no direct relationship between Thrust and Weight.
(Yes, it's a bit simplistic, but it is basically correct.)
Try considering your 737 flying vertically upwards : you'll soon see that you're not getting 80K for free.