There are two sides of power: the outer and the inner. Master both to conquer ancient China. Use soldiers to conquer new provinces and use spies to disclose enemy attack plans and kill their generals.
Starting as an air traffic controller in the year 1925, your small grass airfield grows into a major international airport in 1970. Witness the WW2, the flying mail service in the 1920's, the breaking of the sound barrier, and birth of the passenger jet.
