Commercial air service to Birmingham began in 1928 by St. Tammany and Gulf Coast Airways, at Roberts Field on the west side of Birmingham on a route from Atlanta, Georgia to New Orleans, Louisiana. Delta Air Service began service to Birmingham in late 1929 with six seat Travel Air airplanes along a route from Love Field in Dallas, Texas to Birmingham. When American Airways (now American Airlines) began their Atlanta, Georgia to Fort Worth, Texas route, Birmingham was not included because their Ford Tri-Motors could not land at Roberts Field. Thus, Birmingham began construction of what is now Birmingham–Shuttlesworth International Airport. The airport opened on May 31, 1931, with a two-story, white, Georgian style terminal and a single east–west runway. The terminal was just east of the later 1962 and 1971 terminal complexes. No remains of the 1931 terminal or landscaping are visible. With the addition of American Airlines in 1931 and Eastern Airlines in 1934, air traffic increased enough to warrant a second runway. World War II saw the airport leased to the United States Army Air Forces for $1 a year to support national defense. Birmingham Army Airfield was a section assigned to the Third Air Force as a fighter base, operated by the 310th Army Air Force Base Unit. The Army Air Forces considerably improved the airport with land acquisitions, paving of additional taxiways, and construction of a control tower and an aircraft modification center south of the terminal, now operated by Stewart Industries for aircraft disassembly and disposal. Around the 1940s, Birmingham was considered as a potential air transportation hub for the Deep South. However, Delta Air Lines, Eastern Air Lines and the United States Postal Service each opted to use Atlanta for this purpose instead. One factor was an aviation fuel tax imposed by the City of Birmingham in the 1940s; other factors included Birmingham's location in the Central Time Zone, which placed it at a disadvantage in accommodating traffic between East Coast points, and a relatively strong sales and marketing campaign by Atlanta under Mayor William Hartsfield. After the airport returned to city control in August 1948 Southern Airways began service. In March 1951 four runways were in use, Former Runways 5/23 (now 6/24) and 18/36, and runways at about 45/225 degrees north of Runway 6/24 and 85/265 degrees mostly south of Runway 6/24. Runway lengths were about 4,000 feet (1,200 m) to 5,500 feet (1,700 m). The runway at 45/225 degrees is now largely removed, though a paved portion remains crossing taxiway F near the Alabama Air National Guard facilities, used for airport equipment and helicopter landing/parking. The runway at 85/265 is also mostly removed, with remaining segments making up taxiway A5 and a portion of taxiway F east of Runway 18/36. By 1959, Runway 5/23 was 10,000 feet (3,000 m) and service was started to Birmingham by Capital Airlines with Vickers Viscounts. The first scheduled jets were Delta Convair 880s in October 1961, flying ATL-BHM-MSY-LAX and back. Birmingham then had nonstops to Newark and Washington, DC, but no other nonstops beyond Charlotte, Memphis and New Orleans, and no nonstops to Florida. In the late 1960s Douglas DC-8, Douglas DC-9, Convair 880 and Boeing 727s were all scheduled to BHM. During the 1961 Bay of Pigs Invasion, pilots and crews from the Alabama Air National Guard's 117th Tactical Reconnaissance Wing at Birmingham were selected to train Cuban exile fliers in Nicaragua to fly the Douglas B-26 Invader in the close air support role. Although the 117th was flying the RF-84F Thunderflash, it had only recently retired its RB-26C Invaders, the last squadron in the Air Force to do so; thus the 117th was seen as the logical choice for the CIA's secret mission. Seven of the volunteer aviators participated in combat operations during the final day of the invasion, on August 19, 1961.