There is a way to get everyone out of parachutes. Don't be the leader. If you aren't the leader everyone gets out of parachute. If you are the leader you can team switch for a split second and switch back. AI won't disembark when you order them to but AI as leader says disembark and they do. odd.
Also when AI is in the air it's no different than on the ground. They move into formation whether in the air, on a chute or land.

Also how do you start them in the air? When I do it they always fall correctly, as opposed to standing up. I use: this setpos [getpos this select 0, getpos this select 1, 200];

It is way to slow to get started