HKA: I believe they dont have 777???
Dragonair: I believe they dont have 777???
CX: cadet!
I must say, I do admit your level of research prior to posting.
Took me just a couple minutes to google that...
Good luck.
Edit: I could be wrong for all three as I do not work for any of them, I am sure someone will be kind enough to spoon feed you this information.