The Prydwen

The Prydwen is a modified and heavily armored Brotherhood of Steel airship that flies throughout the skies of the Commonwealth and Boston. Through unknown means or circumstances, it can be severely damaged, causing it to crash to the ground.

Appearances
The Prydwen appears only in Fallout 4

Behind the scenes
Prydwen is the name of the ship boarded by the mythical King Arthur in the Welsh poem Preiddeu Annwfn.