How to unit test drive?

How to test drive premium planes? I saw a couple of videos of guys having 14 day test drives but i cant figure out how to get one.

For specific premium/event vehicles which are no longer available, you can use wiki to see the vehicle in-game, which also sometimes gives you the ability to test drive. Be sure to be logged in the wiki, and if it says that it doesn’t work, then log out and log in again. If you mean temporary test drives, well, they are gained from crates, battlepass, or if youre a CC

As for what they use, they got them bacause they were content creators. So I guess start a youtube channel and grow big…