In the air, broke out global war. You were appointed commander of the defense. You have to organize the defense of their orders from air attack of the enemy. Before setting a defense, you have to understand the importance of the economy to the war. You can not buy modern combat vehicles, if you do not have enough coming in gold. Gains in gold can be improved by specific mines. Different warplanes have their strengths and weaknesses, some have a lot of lives and a small radius of the attack, others may have a big loss, but are limited in glasses health.