What aircraft can fly without an engine?

Depending on the definitions of "engine" and "aircraft" the following can fly without an engine: glider sailplane (rising thermal air columns) parasail (rising thermal air columns, tow cables) hot air balloon, lighter than air balloon (helium, hydrogen, ...) they can stay up, but they're helpless without an engine to steer Frisbee, paper airplane, kite human powered aircraft ( http:/wwwzperiodzihpvazperiodzorg/Air ) bio-engineered bird-like mechanisms bio-engineered insect-like mechanisms virtual aircraft (computer simulations) satellites (in constant free-fall and orbiting a gravitational body) bodies in-flight through external forces (superconductor magnetic levitation) solar sail propelled spacecraft in outer regions of atmosphere.

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