Flying to Hong Kong? How to handle really long flights?

Sleeping is the best thing you can do as it helps make the time go faster. Also sleeping helps you to adjust better to the time zone change so you overcome jet lag faster.

I assume you are flying Delta Airlines. http://www.seatguru.com says the airline is currently updating their economy class seats with the AVOD personal in-flight entertainment system. If you are lucky to have that, you have your choice of movies, shows, games and music. Otherwise, you can read and listen to your iPod.

http://www.seatguru.com/airlines/Delta_Airlines/Delta_Airlines_Boeing_747-400.php

Whenever I fly to Asia, I have been fortunate enough to have a personal in-flight entertainment system on board. However I do try to get as much sleep as possible and do some reading.

Book is certainly better than any IFE. I spend lot of time in contemplating water/ground below as well, is very inspiring.

i think sleeping passes time, often
i just know from Las vegas to HK may need 13 hrs and there may be lots of things to do
books (i think it's enough though)
ipod
draw/paint
drink water (it's dry)
chat with the guy next to you
magazines
newspapers (there may be some on the plane)(i think it's free)
walk (it's a must!!! blood circulation!!!)
toilet(must!!! but i suggest you to go before having lunch/dinner, it'll take ages for the queue
snacks (supply energy)
if you want to, take some photos (no flashlights)
NDS, XBOX etc

i think it's enough, you keep repeating these things till the end of the flight
and have a nice flight^ ^

sleeping. :D passes time real fast.
but mostly they will also have movies online, so you can just watch them. 15.5 hours isnt as bad as it sounds. so dont worry. just sleep, read and watch tv. (: and youll be fine. promise :D

The book should do it.

sleep
poop
eat
mini games
books
movies on flight
ipod
any game device
laptop
meet new people
learn some chinese
did i mention sleep? ;) lol
have a nice flight!