2 . flights
3 . southwest airlines flights
4 . american airlines
5 . united
6 . united airlines
7 . delta
8 . delta airlines
9 . southwest flight
10 . southwest airlines flight
11 . southwest air
12 . frontier airlines
13 . frontier
14 . southwest airlines tickets
15 . expedia
16 . spirit
17 . spirit airlines
18 . cheap flights
19 . southwest airline
20 . travelocity
21 . jetblue airlines
22 . alaska airlines
23 . jetblue
24 . kayak
25 . us airways
