Like many things there is a balance of forces. In an airplane gravity pulls down, and the lift created in the wings pulls up, and those forces go to one side or the other of the balance. read more
The common pump works with a push-pull action ('reciprocating' pump) -- just as you pull-release the kite-string. Also, the cause-effect is very similar: with each stroke the kite, like the water, rises a bit. read more