Flag mini-game:
Press Select on the save game screen to play a mini-game in which flags must be matched to their corresponding countries.
Purchasing U.S. aircraft:
When based in Moscow or Berlin during the Cold War, give money to the foreign representatives from the U.S. that appear. Once the game states that relations with the U.S. have improved, you may purchase U.S. aircraft.
Quicker game:
Hold L or R and press Y to quickly move over the map. Hold Down to scroll text faster.