Air China operates 777 & 343.
Add Asiana & China Southern to that list shortly and Eva Air for next year.
Each type fulfill their needs.
- 777s operate high density regional routes, 333 - medium density regional routes, 343 - medium-density long-haul
- 777s operate high density regional routes, 343 - medium density long-haul
- 777s operate all around, 345 - ultra-long haul
- 777s operate high density regional, 333-medium density regional routes.
- 777s operate long-haul, 333/332 - regional routes
Even between the 772 & 333 there is some capacity differences as the 777 is slightly larger.
- 777s operate all-around, 333 - regional
- 777s operate all-around, 332 - lower-density all-around
- 773 operate long-haul, 332 - lower-density all-around
is probably the most unique that the 772 and 343 basically serve the same purpose, medium-density long-haul.
While the 772ER & A343 are in the same class, there is sizeable capacity difference between the 773 & 333 or 332. The difference can be similar to 757 & 738 for narrow-body routes. Matching capacity & range for specific route pair and with fleet commonalities.
For example, one can wonder why OZ
is acquiring the 333 when they already have the 777 or 763 in their fleet. Well, they have a large fleet of A321s that is still growing and replacing the 734, so it's not such a big jump and pilot training is not too difficult.