Turbulence caused by the air flowing around the wings of an aircraft. The larger the aircraft, the greater the wake turbulence. If you are flying in a small aircraft following a larger aircraft, wake turbulence can flip a smaller aircraft over and cause significant damage. On landing, it is important to note where the larger aircraft touches down on the runway, and you should then land further down the runway. On take-off, the position the larger aircraft leaves the ground should be noted and a smaller aircraft should be off the ground before that position.