MyTax Illinois, to electronically file Form ST-70, Aviation Fuel Sales and Use Tax Return, and Form ST-70-X, Amended Aviation Fuel Sales and Use Tax Return. These forms are not available for download.
For more information, see
FY 2018-13-A. See also the listing of units of local government imposing local tax on aviation fuel sold at retail that have certified an airport-related purpose with the Illinois Department of Transportation (IDOT).