It helps stabilise the flight
The empennage has the sole purpose of stabilising an aircraft when in flight, both horizontally and vertically.
The purpose of the flight in which the first fatal airplane accident occurred was a military demonstration of the Wright Brothers Fly aircraft.
To provide the lift necessary for flight.
Detect, Alert, Control, and Defeat
To provide stability of the aircraft during flight!
Possibly to produce stability or a semi-controlled flight (?)
Their original purpose is enhancing the durability of flights,flight protectors help keeping your spread. edited by .chinadart.com
It's called rifling, and the purpose is to give the projectile a spin in order to stabilize it in flight.
Speed limit for general purpose vehicles
The main purpose for booking cheap flight tickets is to save money. It can cost a lot of money to fly to locations and it's always a good idea to shop for the lowest prices.
"Dauntless" Dive Bombers put holes in the flight decks.