Portal:Transport/Selected anniversaries/July 31
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- 1940 – A doodlebug train in Cuyahoga Falls, Ohio collides with a multi-car freight train heading the opposite way, killing 43 people.
- 1951 – Japan Airlines (pictured) is established.
- 1973 – A Delta Air Lines jetliner crashes while landing in fog at Logan Airport, Boston, Massachusetts killing 89.
- 1999 – Discovery Program: NASA intentionally crashes Lunar Prospector the spacecraft into the Moon, thus ending its mission to detect frozen water on the moon's surface.
More events: October 11 – October 12 – October 13