What airline? Where from and to?
The only place from which I've flown to HAM in recent years has been AMS (3-4 times a year, always on KLM and thus into Terminal 1), and although I must admit that I've not paid very close attention I *think* that arrangements are different depending on whether the aircraft is parked on a jetway or out on the apron. ISTR that if you're parked on a jetway you walk straight out into the departure area (so no problem getting back onto the same flight) but if you're bussed in you are dropped in a different part of the airport.