The Illinois State Police have now taken the lead in an arson investigation in Edgar County.
Two privately owned airplanes were set on fire two weeks ago outside of a hanger at the Edgar County Airport.
The statement "this is our airport" was spray painted on the side of one of the planes.
Investigators have said that they do not have many leads to follow.
They are asking for any tips from the public.
Both planes have been removed from the airport.