Portal:Transport/Selected anniversaries/July 27
- 1663 – The British Parliament passes the second Navigation Act requiring that all goods bound for the American colonies have to be sent in English ships from English ports.
- 1949 – Initial flight of the de Havilland Comet (pictured), the first jet-powered airliner.
- 1972 – The F-15 Eagle flies for the first time.
- 2002 – Ukraine airshow disaster: A Sukhoi Su-27 fighter crashes during an air show at Lviv, Ukraine killing 85 and injuring more than 100 others, the largest air show disaster in history.
- 2005 – STS-114: NASA grounds the Space Shuttle, pending an investigation of the 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.
- 2006 – The Federal Republic of Germany is deemed guilty in the loss of Bashkirian 2937 and DHL Flight 611, because it is illegal to outsource flight surveillance.