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The best way to pay for land expansions is to save up your "greenies" (those green paper bills up in the right corner).

Each weekend, starting on Friday, Game Insight issues a "weekend code" that you can enter just like a friend code to get 3 greenies * 2000 coins.

Then, wait for the monthly expansion sale and pay 10 greenies for each new piece of land.

The best way to earn coins is to do red launches and visit neighbours' planetariums.

Don't try to pay for future expansions with your hard-earned coins- the game makes it too expensive to succeed.

Happy flying!