Well, the engines are producing thrust, pushing it forward, while the air-resistance, or drag, is pushing it backwards. Gravity is pulling the plane down and the air flowing around the wings lifts the plane up.
So when thrust is greater than drag and lift is greater than gravity... WHHHOOOOSSHSHSHHH!!!
Nah, I saw a toyota commercial where a 727 lands without nose gear. The plane lands in the bed of the pickup, its all cgi, but I can't help appreciate the timing of this and the commercial.