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 (Middle Welsh- "handsome") is the name of King Arthur's ship in the native Welsh literature concerning the legendary character. Arthur and his men board it to sail to the Otherworldly fortress of Annwfn in the somewhat cryptic poem Preiddeu Annwfn, as well as when they sail to and from Ireland in the prose text Culhwch ac Olwen, in an attempt to gain a magical cauldron. It is not explicitly named in any other native Arthurian tale or poem, and in the Anglo-Norman literature that drew from it Arthur does not appear to have a comparable vessel.