"Table 3. Top 10 Airlines, ranked by January to July 2004 Domestic Enplanements ",,,, Rank,Airline Name,Jan-July 2003,Jan-July 2004,Jan-July 2003 Rank 1,Southwest Airlines,"43,771,932","47,466,094",2 2,Delta Air Lines,"45,618,279","46,883,939",1 3,American Airlines,"42,879,802","42,928,542",3 4,United Airlines,"32,996,408","34,963,033",4 5,Northwest Airlines,"25,239,624","26,719,372",5 6,US Airways,"21,917,796","22,183,855",6 7,Continental Airlines,"18,121,652","18,493,610",7 8,America West Airlines,"11,233,207","11,620,727",8 9,Alaska Airlines,"7,433,654","8,176,271",9 10, American Eagle Airlines,"6,585,522","8,072,099",11 Source: T-100 Domestic Market,,,,