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- Subject is exactly "United Airports Company of California, Ltd."
[United Airport brochure and first flight air mail cover addressed to William E. Boeing, Seattle, Washington, April 30, 1931]
![[United Airport brochure and first flight air mail cover addressed to William E. Boeing, Seattle, Washington, April 30, 1931]](https://digitalcollections.museumofflight.org/files/square_thumbnails/1ed8fff3b94284bc2ea64215fe05f08e.jpg "[United Airport brochure and first flight air mail cover addressed to William E. Boeing, Seattle, Washington, April 30, 1931]")
United Airport brochure and first flight air mail cover addressed to William E. Boeing, Seattle, Washington, April 30, 1931.Stamped: "First Flight A.M. Route 4 from United Airport, Burbank, California."Stamped: "First Dispatch - Airmail Field Post…