The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Sabre Labs:
Challenge your friends, fellow passengers, or even just yourself to the most enjoyable way to pass the time on your next flight: Travia: Travel Trivia on the Go. Travia is the first travel trivia game that allows you to play live against multiple iOS 7 users also traveling on your flight without any WiFi or cell connectivity needed. Cruise through the sky while you enjoy unlimited entertainment competing against your fellow passengers all for free saving your wallet from those pesky in-flight WiFi charges.Simply turn on your phone, open Travia, and, even in "airplane mode", start a new game or join an ongoing game with other passengers to compete for the ultimate travel trivia crown.