I would love to hear about any apps you use while traveling that are specific to where you are visiting.
In anticipation of several upcoming trips, I have downloaded both Tripadvisor Rome and Paris Guides. They have alot of great info.
Non-specific apps I will probably leverage are TripAdvisor, Yelp, maps, several global news sites I'm always checking out.
my response will not answer your question, however, I did find a website that can be useful for finding more pleasurable flights, with entertainment information, WIFI, and in seat power.