I wouldn't use the 380/330 combination. The A330 is a dying aircraft, its replacement is but a few years away. It would make sense to go for the 350, but that aircraft is 5+ years away. The 380 is only good for a couple routes, while a 748 is a bit more economical if its not always packed (aside from looking a lot better). I would rather invest a much smaller amount of capital in refurbishing the 763/777 fleets to a common premium cabin standard (lie flat C, much better F on the 777), replace the full airplane with the new boeing interiors. There's nothing wrong with a 767 or a 777, its mostly how you outfit it (and from what I've been able to tell, the fuel burn on the 777 is slightly better than the 330 on 3000-6000nm stages). Place the new premium product in the 747, but look towards replacing a lot of those birds in the next 3-5 years 1:1 with the 748.