What do you do in order to fly in airplane?
Options:
- buy tickets
- passenger
- read
- add gas
- run through checklists Let's give stream of consciousness first:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
In order to travel by plane person has to buy tickets first as without tickets person cannot fly in airplane. Buying ticket is an activity.
Therefore, the answer is buy tickets.