They have to use a shuttlebus system to keep people from wandering around the flight line.
No, I mean, what would the regulation be stopping them from using "normal" gate-attached-to-the-airport? I could understand the structure/capacity of the airport forcing it, maybe the regulation is relevant to that?
I doubt it has anything to do with them not having jet-port gates. Usually that's room/money constraints.
At airports like Atlanta, where some airlines have jet-port gates and others don't, it's money/politics. Home field advantage for the bigger customers.
Yeah, I figured it was something like that. Like maybe the "regulations" concern minimum space/capacity things.