The gist of johnnyharvard’s explanation is pretty much right. However, a few of the details need to be fleshed out. (Long explanation to follow)
Prior to airline deregulation, the Civil Aeronautics Board (CAB), the pre-cursor to the FAA, regulated airline service. The CAB determined which airlines served which airports and how often. During this time, both Dallas and Fort Worth had airports with passenger service - Dallas Love Field and Fort Worth Greater Southwest International Airport (also known as Amon Carter Field). Meacham was Fort Worth’s original municipal airport, but when Greater Southwest was built in the 1950s, Meacham became a small general aviation airport with no passenger service as far as I know.
In 1964, the CAB, tired of dealing with two airports less than 20 miles apart and tired of dealing with all of the political jostling coming from both cities, ordered Dallas and Fort Worth to designate a single airport for all interstate air carrier service to and from the DFW area. As you can imagine, neither city was willing to give up their airports. The CAB said that if the cities didn’t resolve the issue, it would choose for them. So the cities agreed to jointly build and support Dallas/Fort Worth International Airport. As part of that resolution, both cities agreed to close their respective airports and move all service to DFW. In addition, all airlines serving both airports also signed agreements to move their service to the new airport.
This was all well and good until about 1972. While the new airport was being built, Southwest Airlines came into being and began offering intrastate service out of Dallas Love. When the new airport opened in 1974, all airlines except Southwest moved as they had agreed. Southwest, however, argued that they could not be made to move from Love. In a lawsuit filed by the Dallas and Fort Worth against Southwest, Southwest won the right to remain at and operate intrastate service out of Love Field. The courts ruled that because Southwest Airlines was authorized by the Texas Aeronautic Commission to operate intrastate passenger service at Love Field, under state law the cities of Dallas and Fort Worth could not require Southwest Airlines to move to DFW Airport or to cease providing intrastate air passenger service from Love Field. As a result, only intrastate service was allowed in and out of Love Field from 1973 to 1978 - intrastate meaning within the state of Texas only.
So, 1974 comes around. DFW opens, all airlines except Southwest move to the new airport, Fort Worth closes and dismantles Greater Southwest Airport, and Dallas is forced to leave Love open so that Southwest can continue operating service to other cities within the state of Texas.
Things go along like this until 1978 when Congress decides to deregulate the airline industry. Now, airlines are free to choose which cities they will serve and how often. The CAB no longer designates which airlines will serve a city. Southwest feels that it should no longer be limited to intrastate only service and gets permission from the CAB to offer flights to New Orleans, outside the state of Texas.
So now Dallas and Fort Worth have spent billions of dollars to build DFW Airport. Fort Worth becomes concerned that Southwest’s expanded service at Love, which in a just world Dallas should have been forced to close as it had agreed to originally and as Fort Worth had done with its airport, will have a negative impact on its investment in DFW. As a compromise, the Wright Amendment was approved by Congress. The Wright Amendment prohibited service from Love Field beyond the state of Texas and the four states that border Texas – New Mexico, Oklahoma, Arkansas, and Louisiana. In 1998, Congress approved the Shelby Amendment, which increased the allowed states to eight, adding Kansas, Mississippi, and Alabama.
So while some people decry how “Un-American” the Wright Amendment is, in my opinion the “Un-American” thing is that while two cities agreed to close their airports, one lived up to the agreement and one did not. One lost exclusive control of its own airport and all the revenue that came with it and now must share revenue with the other city. One got to keep its airport open and still receive revenue from it along with the revenue it shares with the other city from the new airport.
Apparently, agreements are unenforceable and a contract doesn’t mean anything anymore. How’s that for “Un-American”?
Sorry for the long history lesson here, but I find that most people outside of the Dallas/Fort Worth area have little understanding of what the Wright Amendment is really about. Hell, few people in this area have an understanding of it.
::steps down from soap box::