I flew to the US with 2 in cloth. If you can get a night (ish) flight then night time cloth nappies would last the distance.
Incidentally I flew domestic for 5 hours while I was in the US and under pressure from rellies, I ended up using disposables for that flight and the kids both leaked out of their nappies! So I ended up carrying all the wee'd on clothes - so I could've been saved from the trouble had I used cloth, 'cause at least I know I would never get a leak with cloth.
