That about jacking copters (and cars) r yes both lag and it isn't synched right... BUT one time I was playin and the game chrashed (surprise!) well I went back in but all the cars were at the spawn, I got in one and some1 said: "MY CAR WAS STOLEN" so a little demon was born I got into all of the cars and they got jacked too, just a bug.. the server hadn't send me any info who were in what car just that they were movin, so if I entered a car I would send info to that server that I was in that car and the server would send all clients that I was in that car, and the person who was in it, got that msg too and got jacked BUT if ppl got out of the car, and then back in, they would send info to the server in what car they got in, and the server sends me that...
BTW IT WAS PASSWORD PROTECTED SERVER and I knew all of them don't start to think that I'm some bastard
Sry for my english btw...