On February 19-22, 1947 Pioneer Airlines greatly expanded its services by inaugurating two new segments and expanding the original segment of Air Mail Route 64. The first new segment operated from Houston to Dallas via Bryan, Temple, and Waco. The second segment operated from Dallas to Midland / Odessa, via intermediate points Fort Worth, Mineral Wells, Abilene, Sweetwater, and Big Spring. Midland and Odessa (jointly using the Midland / Odessa Airport) and Lamesa were added to the original segment; resulting in a revised section of this segment that operated from San Angelo to (Midland / Odessa) to Lamesa to Lubbock.
This cover was carried on the inaugural Pioneer Airlines flight from the Fort Worth, Texas Airport Mail Facility to Midland, Texas and is listed in the Contract Mail Mail Flights (CAM) Section of The American Air Mail Catalogue as 64W12f.
Following joint application to the Civil Aeronautics Board by Pioneer Air Lines and Continental Air Lines, the latter carrier acquired authority to operate Air Mail Route 64 on December 7, 1954, which authority had been held by Pioneer. By this action, Pioneer Air Lines ceased to be an air carrier with the operation of Air Mail Route 64 being integrated with Air Mail Route 29 on April 1, 1955.