How can an aircraft fly upside down. The wing lift should be in the wrong direction?

shape of airplane's wings (ie: aerofoil) "right way up" forces air passing under them flow @ higher pressure air passing on them. produces upwards force called lift that, well, lifts airplane , make flight possible.

control surfaces @ trailing edge of wings modify overall shape of wings. done angling flaps downwards or upwards. when angled downwards, wing's effective curvature increased, pressure of air under wing increased , lift increased. when opposite done, wing's effective curvature inverted (ie: instead of looking shape of eyebrow, looks smile), pressure of air flowing on wing becomes greater pressure of air flowing under it.

typical fixed wing aircraft have 2 sets of wings: 1 @ front , 1 @ rear. control surfaces of wings @ front, called ailerons typically control roll of aircraft while @ rear, called elevators control pitch (whether nose points or down). done modifying amount , direction of lift acting on each of these wings.

aircraft right way gain altitude, ailerons angled upwards (creating higher pressure above wings below them) push tail of aircraft down, angling thrust , direction of travel of aircraft upwards. reverse applies when aircraft dive - ailerons angled downwards push tail upwards.

because inverted aircraft have lift generated wings working in direction of gravity (downwards), counteracting force have applied keep aircraft airborne. ailerons modifying pitch of aircraft aircraft travels angles upwards (downwards in relation upside down pilot) enough counteract gravity , negative lift.

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