You can purchase some aircraft liveries, alliance emblems, as well as unique buildings in the game store with Tokens. Tokens come in 2 types: Silver and Gold.
Silver Tokens can be obtained by launching rockets into space. Both Silver and Gold Tokens are issued for top places in flight ratings. Tokens can also be purchased at the Bank.
Play the game, launch rockets, and send out flights to get Tokens, and you will definitely succeed!