I have to say I only know the basics of how a plane works. But one thing I'm still wondering about; Does the Thrust generated by a plane's engines need to be greater than the weight of the plane, for it to move, and thus take off?
Looking at the specs for a Boeing 747-400, I see that it weighs 800,000, but the engines produce 63,300 lb of thrust (is this for one engines, or all 4?).
This may be a "Duh!" moment for you guys, but bear with me
