Rosbif i guess you rhink Cargo Jet is a foriegn carrier then????? Air Canada currently wet-leases a coupke of CArgo Jet B727's to transport cargo domestically. Cargo Jet is Canadian and they are doing it cheaper then ACE Cargo was able to so now with the same type aircraft and more reliablity, due to Cargojet having spare aircraft sitting in YVR and Hamilton to replace a mechanical plane as they don't fly until the evening and AC's leave in the morning at least in YVR, Air Canada is able to create more profits then with ACE.
Also I remeber Air Canada doing some Pasanger flights for QANTAS not long after Sept 11 and the collapse of Ansett Austrailia. That was only until QANTAS was able to get more lift themselves. Also when CAthay had to ground their A330's Air Canada flew there A340's that would just be sitting in HKG anyway for Cathay Pacific to replace some of the flights CX's A330's were doing. It works both ways, World and Gemini are providing Lift until Air Canada gets the 2 B777F's and if the demand is there the order will be increased.
Plus the B777-200LRF Can carry the same amount of cargo the MD 11 can a liitle further and has only 2 engines, plus a lower fuel burn.