I'm really curious, too about those numbers on the 321 NEO. When I flew the 757 we had many 6 hour plus days out to the islands, 7 hours a few times to LIH. Now I know HI is just doing west coast routes but that's pushing it for a 321. Also, you are limited to FL 320 for a while going out so heavy. There may be congestion on the tracks with a bunch of 321s sitting down so low. The 757s and 767s and the larger jets can all go a lot higher.