The first list listed in the new catalog as AM27S27. The pilot was Sanford Chandler. The autograph on yours is only a postmaster. The catalog value as of 2017 is $2.00 which means that on a good day you might get $1 for it.
The second and third covers are not first flight covers and so they are not listed in the American Air Mail Catalog. They are considered more as commemorative covers that were flown in an aircraft that on a special event or day. In general, such commemorative covers might sell for three or a dollar. However, the Kohler Aviation Corporation one has a pilot autograph on it which elevates it slightly above this otherwise very modest commercial value. The pilot is Everett L. McMillan but unfortunately he was not a famous pilot so his autograph adds only $2 to $4 to the value. McMillan's only slight claim to fame was that in 1946 he was the pilot of a DC-6 airliner that crashed and burned in Utah killing 47 passengers and 6 crew members including himself. Most people do not remember such pilots in the way they do ones that set new records or won flying races or such.
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