(70 ILCS 1865/4.12) (from Ch. 19, par. 182.12)

Sec. 4.12.

For the prevention of accidents, for the furtherance and
protection of public health, safety and convenience in respect to
aeronautics, for the protection of property and persons within the District
from any hazard or nuisance resulting from the flight of aircraft, for the
prevention of interference between, or collision of, aircraft while in
flight or upon the ground, for the prevention or abatement of nuisances in
the air or upon the ground or for the extension of increase in the
usefulness or safety of any public airport or public airport facility owned
by the District, the District may regulate and restrict the flight of
aircraft while within or above the incorporated territory of the District.

(Source: Laws 1961, p. 3531.)