Sheridan County Airport

Sheridan once again has scheduled passenger airline service with nonstop flights to Denver . Air service had been subsidized by the federal Essential Air Service program until February 2007, when Big Sky Airlines began providing subsidy free service The Big Sky service was suspended in January 2008 when this air carrier went out of business. Great Lakes Airlines was the only other carrier at Sheridan but this carrier abruptly ceased all flights on March 31, 2015. Many Sheridan residents were confused regarding the lack of replacement service, believing that service to Sheridan was still subsidized under Essential Air Service. Federal law had been changed in 2012 so that once Sheridan County had left the EAS program, it could not re-enter it and commercial air service to Sheridan is not funded by EAS anymore.
Federal Aviation Administration records say the airport had 17,710 passenger boardings in calendar year 2008, 14,181 in 2009 and 14,146 in 2010. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a primary commercial service airport .

Wikipedia