[Eagle of Fire]

Any you guys do similar things with planes?

Of course.

I really hate using Helicopters because you almost need an airport only for them unless you wish to have your planes clugged when they land. If you still have old small airport from the beginning of the game they can become reliable and give out money by oppening helipads in towns around the small airport. Another use is to build one right next to an extremely busy bus stop and try to take out some of the passengers out from the weight of the bus stop since once you add too much bus the stop is even less efficient. This way you could create some major buck.

I myself usually only use them on oil rigs to be sure they'll have everything and are more likely to grow. I never actually be able to prove my point but I never took the chance since the oil rigs are usually my main source of income for about 3/4 of the times.