flaps

Three experts who spoke to BBC Verify suggested that the disaster may have occurred as the aircraft's flaps were not extended during take-off - though other pilots and analysts have challenged this.

The idea is for the flaps of the front wing to bend downwards under load at speed, reducing drag, before moving back up to increase downforce for corners.

And these flaps of skin were dropping down, and it became more funny than scary.

However, he noted the plane was without its landing gear and wasn't using its flaps in the expected way, suggesting that "everything happened really quite quickly".

Sometimes, Trump ultimately defuses such flaps by saying he was only joking.