Name something people pay extra for when they are taking an airplane flight.
| 1 | business class | |
|---|---|---|
| 1 | class | |
| 1 | first class | |
| 1 | upgrades | |
| 2 | sodas | |
| 2 | pops | |
| 2 | juices | |
| 2 | ginger ales | |
| 2 | drinks | |
| 3 | earphones | |
| 3 | headphones | |
| 4 | assurance | |
| 4 | coverage | |
| 4 | flight insurance | |
| 4 | insurance |