The Air Chamber is a counterpart to the Creature Chamber that is specifically designed to create flying creatures. It is the only structure capable of doing so, and flying creatures are the only kind of creature it can build. A player may construct multiple Air Chambers to buid up an air force more quickly, as it can only create one creature at a time.
The Air Chamber can only create a creature if its appropriate research level has been unlocked. For example, research level 4 must be completed before level 4 creatures can be created. Creatures of higher research levels typically require more time to create. One should also note that the Air Chamber cannot be built until research level 3 is reached, and that all flying creatures are level 3 or higher by default.