I agree with Ozz
In fact adding Chess and Poker game to the flight trip (Requiring Laptop), would be a great addition. I know that you are supposed to loose almost all game actions when flying. But these adding these two games, would make a great addition. Also it might bring a lot more action to the game.
When people fly, many only bring roughly what they need. Those that have lots of money will be storing them different places, and often only bring low amounts of money when traveling.
Adding the Poker and Chess game would mean that those players (Those who want to play while traveling) would have to bring more, in the event that they loose money in the game. Also overplaying, and loosing, would mean you might suddenly not have the money when you land that you were supposed to, which makes it a bit more fun.
Also there is the chance that people suddenly win big on the trip, and when they land they will be loaded with money, and thus worth mugging.
I really think this should be considered, it will definitely add to the game, without ruining too much of the "No actions possible" travel.
Maybe a fix that would suit all would be that you could play chess or poker with those on the same flight (travelling to the same destination) - wouldn't be that difficult to code.
That would make it quiet restrictive and possibly unlikely to find competitors, also what would happen when one player arrives at his destination (& gets on return flight) would the game be allowed to continue.