When it opened, DFW had four terminals, numbered 2W, 2E, 3E and 4E. During its first year of operations, the airport was served by American Airlines, Braniff International Airways, Continental Airlines, Delta Air Lines, Eastern Air Lines, Frontier Airlines, Ozark Air Lines, Rio Airways and Texas International Airlines. The Wright Amendment of 1979 banned long distance flights into Love Field, leaving Southwest Airlines as Love Field's only jet airline and operating solely as an intrastate air carrier in the state of Texas.