All airplanes can intentionally roll upside down, doing what's termed a barrel roll. Only planes that are specifically designed for it can stay inverted for very long, though. Assuming it happened at cruising altitude, recovery's no problem at all.
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The MD-80, as with all commercial airliners, was designed to fly upright. Commercial airliners are only tested and certified for upright flight.? However, one Boeing aircraft has flown upside down ? twice! It happened in August 1955.
While turbulence can feel scary, airplanes are designed to withstand massive amounts of it. A plane cannot be flipped upside-down, thrown into a tailspin, or otherwise flung from the sky by even the mightiest gust or air pocket, wrote pilot Patrick Smith on his site, AskThePilot.com.
The issue that mainly comes to mind with the Boeing 747 is that it would not be able to maintain a level flight if it went upside down. As soon as the Boeing 747 becomes inverted, the engines will 'flame out' due to the lack of fuel passing through the lines.
The Loganair Westray to Papa Westray route is the shortest scheduled passenger flight in the world. Flights on the route are scheduled for one and a half minutes, and actual flying time is closer to one minute. The record for the fastest flight is 53 seconds.
A flat spin is a spin where, the aircraft is in a balanced state. It just spins round and around like a spinning top. It won't recover because the forces acting on the airplane are in equilibrium. Controls and engine power become completely ineffective.