First of all, I'll say that I've downloaded these vehicles and I think they could work, I was editing a map, all went good, but when I begun exploring the map, I tried to drive a pelican, but it was undrivable, the only boardable seats were the ones of the corners, then I went to a plane that I downloaded and it was undrivable too, (It had 2 seats) Then, I remade then but they was still undrivable. This just happens to me with the pelican and the jet. Is there something wrong with the seats?

The vehicles don't have the same seat labels as the animations for the player.

To fix this you could change the seat names in the vehicle tag to something in the animations such as W-driver or G-driver.