Yeah, I dunno--I know that in the past JFK has had some airlines split over two terminals (at least some domestic), b/c I almost got caught out once, & cabbies always seemed to ask, w/certain airlines, what our destination was. I did a little googling & found a site that said Delta was split but a whole bunch of ones that weren't.

JFK is huge. There's no way all the terminals could be connected; they used to run buses between them but now have a monorail (which I know is outside of airport check-in security boundaries).

Perhaps Delta might have some suggestions as to the feasibility?