| Rank | Search Term | Volume |
| 1. | southwest airlines | 8.86% |
| 2. | american airlines | 3.80% |
| 3. | united airlines | 2.97% |
| 4. | continental airlines | 2.72% |
| 5. | delta airlines | 2.54% |
| 6. | us airways | 2.20% |
| 7. | northwest airlines | 2.04% |
| 8. | southwest.com | 1.74% |
| 9. | southwest | 1.67% |
| 10. | delta | 1.56% |
| Source: Hitwise | ||