Portal:Transport/Selected anniversaries/July 27
- British Parliament passes the second Navigation Act requiring that all goods bound for the American colonies have to be sent in Englishships from English ports.
- 1949 – Initial flight of the de Havilland Comet (pictured), the first jet-powered airliner.
- F-15 Eagleflies for the first time.
- killing 85 and injuring more than 100 others, the largest air show disaster in history.
- external tank's continued foam-shedding problem. During ascent, the external tank of the Space Shuttle Discovery sheds a piece of foam slightly smaller than the piece that caused the Space Shuttle Columbia disaster; this foam does not strike the spacecraft.
- DHL Flight 611, because it is illegal to outsource flight surveillance.