US Mail plane A. M. 34. This Northrop Delta model was a rare airplane. The Delta was built as a commercial passenger transport, but a 1933 ruling that commercial passenger planes must have more than one engine, for safety reasons, limited the plane's uses.
For more information on the Michael Lemberger Collection visit https://aspace.lib.uiowa.edu/repositories/2/resources/3157
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US Mail plane A. M. 34. This Northrop Delta model was a rare airplane. The Delta was built as a commercial passenger transport, but a 1933 ruling that commercial passenger planes must have more than one engine, for safety reasons, limited the plane's uses. For more information on the Michael Lemberger Collection visit https://aspace.lib.uiowa.edu/repositories/2/resources/3157