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.

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