# Fortress Of The Sky

This documentary chronicles the design and development of the Boeing B-17 Flying Fortress bomber.

- Kind: Short
- Year: 1944
- Runtime: 23 min
- Genres: War, Documentary
- Archive: [Internet Archive](https://archive.org/details/FortressOfTheSky)
- Licence or status: [Public domain (Creative Commons dedication)](http://creativecommons.org/licenses/publicdomain/) (as the archive states it)
- Who can watch: Teens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

Not offered: its uploader marks it public domain, and the US Copyright Office's records do not settle that it is (a record that may be another film's, a film first published abroad, a year when renewal was automatic, or a country they do not name). Unclear is not offered.