Aircrafts need a combination of procedures to fly in the air. They need a propulsion system – a propeller or a jet engine. They also need a lift, which comes from their wings. While flying, the forward thrust causes the air to flow at great speeds along the wings and their slightly titled position give rise to a low pressure above the aircraft and high pressure below it. This is how the aircraft is pushed upwards. The pressure difference thus generates buoyancy, which is greater than the weight of the aircraft, which pulls it down. The aircraft will fall if the buoyancy is less.
