Southwest, which pioneered a point-to-point routing strategy and became the most profitable U.S. airline, uses Love Field as its base. Dallas-Fort Worth is American Airlines' super-hub.
Since 1979, the Wright Amendment has restricted Southwest's flights from Love Field to eight states.
Sen. John Ensign, R-Nev., introduced a bill Tuesday to let Southwest fly wherever its customers want to go from Love Field. A similar House bill has 28 co-sponsors.
Observers say such a measure would devastate American, a legacy carrier whose hub-and-spoke strategy has cost it millions. Supporters of American Airlines, including Sens. James Inhofe, R-Okla., and Tom Harkin, D-Iowa, proposed a bill to close Love Field to all commercial air traffic, forcing Southwest to use D/FW Airport.
Southwest slammed the Inhofe-Harkin bill.
"That is like Wal-Mart saying to the hardware store, 'I have a nice piece of land next to my SuperCenter. Come over and compete and get sliced to death,' " Southwest chairman Herb Kelleher said.