Join Date: Oct 2006
Location: London, UK
Programs: BA Gold, VS Silver, SQ Silver, IHG Plat Amb, Hilton Gold, Marriott Plat, Accor Silver, Radisson Prem
Posts: 16,871
The standard operating procedure for the airbridges (at least at T5) is that for 747s on arrival, the airbridge goes to Door 1, allowing F passengers off first, followed by the subesequent cabins (which does mean that on the mid-J 747s, WTP passengers disembark before main deck CW).
After all pax have disembarked, the airbridge is moved to Door 2 for departure, as this provides more efficient boarding of WT passengers.