Name something people pay extra for when they are taking an airplane flight.
| 1 | business class2 | |
|---|---|---|
| 1 | class2 | |
| 1 | first class2 | |
| 1 | upgrades2 | |
| 2 | drinks2 | |
| 2 | ginger ales2 | |
| 2 | juices2 | |
| 2 | pops2 | |
| 2 | sodas2 | |
| 3 | earphones2 | |
| 3 | headphones2 | |
| 4 | assurance2 | |
| 4 | coverage2 | |
| 4 | flight insurance2 | |
| 4 | insurance2 |