Great Lakes Airlines shut down operations last night at midnight.
End of an era.
https://www.denverpost.com/2018/03/27/great-lakes-airlines-suspends-flights-dia/
http://greatlakesav.com/alerts/Great%20Lakes%20Suspends%20Scheduled%20Turboprop%20Flight%20 Operations.pdf
ADI Aerodynamics will still continue to operate their Great Lakes Jet Expess branded codeshare flights to Pierre and Watertown, SD from Denver.