| Rank | Search Term | Volume |
| 1. | southwest airlines | 9.96% |
| 2. | american airlines | 3.86% |
| 3. | united airlines | 3.35% |
| 4. | continental airlines | 2.72% |
| 5. | delta airlines | 2.13% |
| 6. | us airways | 2.10% |
| 7. | northwest airlines | 2.02% |
| 8. | southwest | 1.65% |
| 9. | delta | 1.54% |
| 10. | allegiant air | 1.46% |
| Source: Hitwise | ||