Miami International Airport was formed by combining Pan American Field with U. S. Army airfields by relocating the Seaboard Coast Line railroad tracks that ran just to the south of Pan American Field. The actual purchase of Pan American Field by the Port Authority happened a couple of years later.

The above photos and caption are from The Miami Daily News on Sunday, September 30, 1945, that is on display at the Miami Springs Historical Museum. I believe that the "ATC" label on the photo stands (middle top) for the Air Transport Command, and the MIATSC stands for Air Technical Services Command. The ATSC was established as the Army Air Forces Material and Services on July 14, 1944, organized as a major command on July 17, 1944, redesignated as the Army Air Forces Technical Serice Command on August 31, 1944, redesignated as the Air Technical Service Command on July 1, 1945, redesignated as the Air Materiel Command on March 9, 1946, and redesignated as the Air Force Logistics Command on April 1, 1961. (Thanks Walter Wilson!)

The caption reads: "Pictures on this page represent the first aerial views released since the start of the war of principal Miami airport developments. These show graphically the tremendous expansion made by the armed forces here. Above is viewing showing, in figure 1, the much discussed 36th St. airport, now held by Pan American Airways which the newly created Dade County Port Authority proposes to purchase for $2,415,086.33. By linking this with army installations shown in figure 2, the port authority hopes to create a major airport which would service the transport needs of Miami for at least ten years. Included in this plan would be the purchase of the pictured Seaboard Air Line interests, as well as the planned removal of tracks and other improvements for a total cost of about $1,000,000. The army installation has been appraised, including land occupied by it together with improvements, at $1,717,900. The new airport survey suggests that it might be obtained at little or no cost with the understanding that it might again be used by the army in the event of another national emergency. The Convair plant is known to be available for $700,000. The over-all cost has been set at about $8,000,000. At left, is same perspective as aerial view, is map showing the proposed 36th St. master airport."