Airlines moving to T3 - Departures from T1, Arrivals into T3
The airport’s website has been updated ref terminal allocations. Example here taken for BA:
Important information for British Airways Airline passengers
British Airways passengers will depart from Terminal 3 (T3) gates, but still go through Terminal 1 (T1) check-in and security. Arrivals will be at Terminal 3.
If departing from Manchester, please check-in at Terminal 1 and proceed through Terminal 1 security. Just before World Duty Free in the T1 departure lounge, please follow signs for ‘Terminal 3’.
Arrivals in Manchester will be landing at Terminal 3.
Please bear this in mind when making drop-off and pick-up arrangements or car parking bookings. Terminal 1 and Terminal 3 are a five-minute walk from each other and there is signage in place to direct you.
Please check your boarding card or contact your airline for more information about which terminal your flight will depart from.