| - | ACCIDENT DETAILS |
| Date: | August 29, 1948 |
| Time: | 1705 |
| Location: | Near Winona, Minnesota |
| Operator: | Northwest Orient Airlines |
| Flight #: | 421 |
| Route: | Chicago - Minneapolis |
| AC Type: | Martin 202 |
| Registration: | NC93044 |
| cn / ln: | 9165 |
| Aboard: | 37 (passengers:33 crew:4) |
| Fatalities: | 37 (passengers:33 crew:4) |
| Ground: | 0 |
| Summary: | Crashed following the separation of the left wing after the aircraft entered a thunderstorm. Loss of the outer panel of the left wing which separated as a result of a fatigue crack which was induced by a faulty design of a wing flange, aggravated by severe turbulence of the thunderstorm. |
Sources
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