col : rank | city | passengers | top carriers row 1 : 1 | los angeles, ca | 700,000 | american, spirit, united row 2 : 2 | chicago, il | 673,000 | american, spirit, united row 3 : 3 | denver, co | 654,000 | frontier, spirit, united row 4 : 4 | san francisco, ca | 492,000 | united row 5 : 5 | dallas/fort worth, tx | 488,000 | american, united row 6 : 6 | newark, nj | 480,000 | united row 7 : 7 | las vegas, nv | 442,000 | spirit, united row 8 : 8 | charlotte, nc | 441,000 | united, us airways row 9 : 9 | atlanta, ga | 400,000 | delta, united row 10 : 10 | phoenix, az | 393,000 | united, us airways
which cites does  george bush intercontinental airport fly to? which do not have american airlines flights? which of those cities is ranked highest?
denver, co
Rank City Passengers Top Carriers
which of those cities is ranked highest?
1 Los Angeles, CA 700,000 American, Spirit, United
2 Chicago, IL 673,000 American, Spirit, United
3 Denver, CO 654,000 Frontier, Spirit, United
4 San Francisco, CA 492,000 United
5 Dallas/Fort Worth, TX 488,000 American, United
6 Newark, NJ 480,000 United
7 Las Vegas, NV 442,000 Spirit, United
8 Charlotte, NC 441,000 United, US Airways
9 Atlanta, GA 400,000 Delta, United
10 Phoenix, AZ 393,000 United, US Airways
Denver, CO
which of those cities is ranked highest? || which do not have american airlines flights? | which cites does  george bush intercontinental airport fly to?