I just downloaded JFK for FSX. Been using O'hare and Las Vegas for a while. I'm also using Ultimate TrafficX and World of AI scenery. The planes at JFK are behaving strangely.
Probably, using two set of traffic, one of them (WoAI) being for FS9, is probably not the best choice, there might be strange issues, also considering UT2 generates traffic in an entirely different way than other products.
Also, I fly the Flight1 MD80 and the ground traffic appears to stay well behind the plane likes it got the plague and won't move up behind it
This can't be a scenery problem but, more likely, an unusual radius in that airplane so, the ground vehicles think the airplane is bigger than it is. Does it happen with other airplanes, the default ones maybe ?
After I get on a runway the rest of the waiting traffic all moves up. Regarding incoming traffic landing, they're getting continual go-arounds when there's no traffic on the runway.
Maybe there *is* traffic, buy you don't see it, either because WoAI is made for FS9 and sometimes FS9 traffic disappears in FSX, but might also be an interaction between WoAI and UT2. I suggest using only one traffic package.