I don't have specific information about this airplane. A-6890 was a Boeing FB-1 flown by the Marine Corps. Joe Baugher's site identifies it as one of a series of Bureau numbers A-6884 through A-6893. It is probably serial number 744. Below, courtesy of the San Diego Aerospace Museum Flickr Stream (SDAM), is a rear quarter, port profile of A-6890.
Boeing FB-1, A-6890, Date & Location Unknown (Source: SDAM)
A-6890 landed twice at Tucson. The first landing was on Tuesday, December 14, 1926 at 4:30PM. The solo pilot was Lieutenant W.L. McKittrick. Based at Quantico, VA, he was westbound from El Paso, TX to San Diego, CA. He remained in Tucson overnight, departing to San Diego the next day at 12:45PM. No reason was given for his trip.
The second landing was on Wednesday, August 21, 1929 at 5:45PM. The solo pilot was M.S. Boggs. Based at Washington, DC, he was eastbound from San Diego, CA to El Paso, TX. He noted in the remarks column of the Register, "Dept. [of] Commerce." He remained overnight at Tucson, departing the next day at an uspecified time. He appeared to be part of a flight of three FB-1s, A-6891 and A-6885. All were based at Washington, DC and headed east on the 22nd. All cited "Department of Commerce" in the remarks column of the Register.
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