Aerodynamics marks a new branch in knowledge: the beginning of heavier-than-air Flight. Besides offering the <l:8,24>Air Base<e>, Aerodynamics gives Civilizations the <l:1,131>Fighter<e> and the <l:1,120>Aircraft Carrier<e>, opening the air and sea as battlegrounds. Aerodynamics also gives the <l:2,34>Airport<e> - a source of steady revenue.