To begin getting ready for Air Canadian/Star Alliance airlines to move into Terminal 1 at YYZ in June, the other airlines are begining to move from Terminal 1 to Terminal 3. The first of these airlines will be Air Transat which will move to Terminal 3 on Mrach 29th, the next move from Terminal 1 to terminal 3 will be all remaining US carriers to move on April 1st, and then Skyservice and Royal on April 26th and 27th respectivly. All Terminal 1 airlines will have moved from that terminal to terminal 3 by June 3rd when Air Canada, Canadian, The Star Alliance, LOT, CSA, and Alitalia all move their International Operations to Terminal 1. AC/CP/UA will remain at T2 for Domestic, RAPIDAIR, and USA flights. The Tunnel between T2 and T1 will be re-opened to allow easy transfer of AC/CP/StarAlliance pax between International and Regional operations. Also Air Ontario will be moving it's domestic ops to Terminal 1 at Pier 1 and 6, where all gates will be removed.
For more details on the airline re-location schedual visit: