Designed by William Stout and George Prudden, the 1923 1-AS Air Sedan was all-metal construction with corrugated skin. First all-metal commercial airplane in the US and basis for the 2-AT.
Test-flown by Eddie Stinson, it was powered by a 90hp Curtiss OX-5, replaced by a 150hp Hisso when it was apparent only 3 passengers could be carried with the OX-5. With the Hisso engine. Five could be carried.
One 1-AS Air Sedan was built, plus another as 1925 model TT single-place for evaluation by USPO as a “flying mail truck”.
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