As the price differential to airfares from major hub airports such as Chicago O'Hare grew, demand for tickets from Willard fell and caused airlines to leave.

Until 2014, the airport was home to the University of Illinois Institute of Aviation, a research and pilot training facility.

The university trustees voted to shutter the institute in 2011 while allowing enrolled students to complete their studies.

[8] The airport gained some notoriety for a January 21, 1998, incident in which Air Force One became stuck in mud, requiring a backup aircraft to transport President Bill Clinton from a speaking engagement at the University of Illinois' Assembly Hall.

Due to the wide turn, the right main gear left the taxiway and slipped into the soft turf, causing the aircraft to be lodged in the mud.

[10] The airport also announced plans to expand the passenger terminal and TSA facilities as well as to upgrade the taxiway design to remain aligned with FAA standards.

In addition, plans for new firefighting facilities are in the works, especially featuring the airport's first new fire truck in 19 years.

Demand had recovered by 2022, and the airport began seeking ways to attract additional flights to Washington, DC.

This requires raising money to support a minimum revenue guarantee for prospective airlines operating these routes.