The wingspan on the 777 was already pushing the limits on what airports could accept for handling, and Boeing decided that, given potential flutter problems with winglets, they'd just as soon do without them.
winglet
Winglets is a new feature added to more recent aircraft designs. It requires a special design of the wing and winglet so as to perform properly. You can take an older aircraft and add an end plate that will provide some improvement in wing performance but it will not be equivalent as adding a winglet. The decision to add a winglet involves evaluating the structure and the cost of the design and the impact it will have on fuel use and flight performance.
simply - "winglet"
39% of 777 = 39% * 777 = 0.39 * 777 = 303.03
12% of 777 = 12% * 777 = 0.12 * 777 = 93.24
33 777
777 account
1554
777 account
The 777-200 can carry 117,348 litres ; the 777-200ER 171,176 litres ; the 777-200LR 181,283 litres; the 777-300 171,176 litres and the 777-300ER, 181,283 litres
777 = DCCLXXVII
0.577 777 777 777 = 577,777,777,777/1,000,000,000,000 which is approximately 26/45