Isn't that a Train, not an Airplane?

Yes. It is a train, not an airplane. The name of the railroad is a marking tool to demonstrate how fast their locomotives were expected to travel. The

picture on the front of this post card is of the Seaboard Air Line #2028 power car. It was built in 1936 by the St. Louis Car Company and it was used to pull two or three other cars from branch lines to the main connection points with Seaboard Air Line’s main line. Our friends at Wikipedia tell us this: “The Seaboard Air Line Railroad (reporting mark SAL), which styled itself as "The Route of Courteous Service", was an American railroad that existed from April 14, 1900, until July 1, 1967, when it merged with the Atlantic Coast Line Railroad, its longtime rival, to form the Seaboard Coast Line Railroad. Predecessor railroads dated from the 1830s and reorganized extensively to rebuild after the American Civil War. The company was headquartered in Norfolk, Virginia, until 1958, when its main offices were relocated to Richmond, Virginia… At the end of 1925 SAL operated 3,929 miles of road, not including its flock of subsidiaries; at the end of 1960 it reported 4,135 miles. The main line ran from Richmond via Raleigh, North Carolina, Columbia, South Carolina, and Savannah, Georgia to Jacksonville, Florida, a major interchange point for passenger trains bringing travelers to the Sunshine State. From Jacksonville, Seaboard rails continued to Tampa, St. Petersburg, West Palm Beach and Miami… The complex corporate history of the Seaboard began on March 8, 1832, when its earliest predecessor, the Portsmouth and Roanoke Railroad was chartered by the legislatures of Virginia and North Carolina to build a railroad from Portsmouth, Virginia, to the Roanoke River port of Weldon, North Carolina. After a couple of months of horse-drawn operation, the first locomotive-pulled service on this line began on September 4, 1834, with a twice-daily train from Portsmouth to Suffolk, Virginia, 17 miles away." This complex history can be better followed by going to this website: https://www.american-rails.com/seaboard.html

Once again the mystery publisher strikes!!!