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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,
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,
What else can I help you with?
What do you call an aircraft that can fly without an engine?
glider
How can aircraft fly without and engine?
an engine-less aircraft is more likely to glide than fly. It may gain altitude by riding on updrafts though.
A plane without an engine?
A glider which is alight aircraft designed to fly for long periods without using an engine.
Is the flight of aircraft made possible by engine and wings?
They are an important part of the aircraft that makes it fly. There are many other parts without which the airplane cannot fly.
Why do people fly with aircrafts?
Because without an aircraft, we can't fly.
What is the purpose of engine in aircraft?
To make the airplane move and fly.
What causes aircraft's to fly?
Lift from the wings and thrust from the engine.
What is an aircraft that flies without an engine?
Glder
What is an aircraft without a engine called?
Its a glider
What is the definition glider plane?
A glider is an aircraft that does not have an engine. To fly it must be towed into the air by a vehicle or another aircraft.
Can aircraft fly without wings?
If it didn't have wings, it'd be a rocket.
How did Charles Lindbergh fly over the Atlantic?
In a one-engine propeller aircraft, alone.
