Aircrafts Staying Level in Upside Down Flight: How Is It Possible?

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Some airplanes can maintain a level flight even when inverted by angling the plane to ensure the wings generate lift through a high angle of attack. The engines also contribute by pulling upward during this maneuver. Although the fuselage may appear horizontal, the wings still operate at an angle of attack greater than zero. Stunt planes typically feature symmetrical wing sections, allowing them to perform effectively in inverted flight. This combination of techniques enables sustained flight in an upside-down position.
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How can some airplanes sustain their flight level even when they are upside down?
 
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Poorly. :)

But it can be done. They are not really in level flight, they angle the plane high (or low?) so that the wing - even inverted - provides lift due to a high angle of attack. The engine is also pulling upward.
 
Along the same lines, the fuselage may appear to be horizontal, but the wing still has an angle of attack greater than 0.
 
Stunt planes often have symmetrical wing sections. In this case, the wing itself will perform just as well upside down.
 

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