| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| history of air transportation timeline | 0.62 | 0.8 | 7825 | 36 | 38 |
| history | 0.3 | 0.7 | 5576 | 99 | 7 |
| of | 1.61 | 1 | 7971 | 87 | 2 |
| air | 0.93 | 0.6 | 710 | 3 | 3 |
| transportation | 1.86 | 0.1 | 2711 | 47 | 14 |
| timeline | 1.86 | 0.1 | 402 | 50 | 8 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| history of air transportation timeline | 1.57 | 0.2 | 2109 | 65 |
