flaps

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.

Inflating the air chamber forces the fins to bend -- similar to the down stroke when a manta flaps its fins.

The museum’s website details the plane’s rich history and how it was built with inventive flaps and cables.