First I'm having an issue that I am trying to solve with this plugin.  I have a player named Axos I'll use as reference for this scenario.

I buy a minicopter from Airwolf.  I sit in the mini and fly in it.  I put a lock on it and take a lock off.  My OwnerID never attaches.

Axos now walks up to the mini, sits in it, and his OwnerID is now attached to the mini, and I can no longer put my lock on it.

I was trying to solve this by using this plugin to spawn Mini from Airwolf with the OwnerID, but it still shows OwnerID 0.

I have set the permissions.

Something I am doing wrong?

Using the permissions feature from this plugin, this owner id should apply as soon as you purchase the vehicle. Can you check at that time? Check directly using a plugin such as Entity Owner. Wondering if the owner is getting unset later, since you mentioned that a player getting into the vehicle changes owner id which wouldn't happen unless you have another plugin doing that.

The permissions must of been doing something funky with /perms.  I granted all manually then it worked, then I removed all and set specific copter ones and it worked.  You can mark this resolved!