Keyword number 2 . southwest
Keyword number 3 . southwest airlines
Keyword number 4 . flights
Keyword number 5 . allegiant airlines flights
Keyword number 6 . allegiant flights
Keyword number 7 . frontier
Keyword number 8 . frontier airlines
Keyword number 9 . spirit airlines
Keyword number 10 . spirit
Keyword number 11 . american airlines
Keyword number 12 . delta
Keyword number 13 . delta airlines
Keyword number 14 . allegiant air flights
Keyword number 15 . cheap airlines
Keyword number 16 . united
Keyword number 17 . united airlines
Keyword number 18 . allegiant airlines reservations
Keyword number 19 . southwest flights
Keyword number 20 . southwest airlines flights
Keyword number 21 . cheap flights
Keyword number 22 . alaska
Keyword number 23 . alaska airlines
Keyword number 24 . allegiant airline
Keyword number 25 . allegiant las vegas
