Cheyenne, WY – Officials at Great Lakes Airlines believe the energy boom in northeastern Wyoming could also be a windfall for them. The airline is changing its Sheridan and Gillette service. Great Lakes currently operates 3 round-trip flights every day from Sheridan to Denver, and 4 from Gillette. The airline is keeping that the same, but one flight to each town will be upgraded from a 19-seat plane to a 30-seat plane. Great Lakes CEO Chuck Howell says Gillette and Sheridan are growing air service markets, thanks to growth in oil and gas, so they want to take advantage of that. Flights from Gillette and Sheridan on the 30-seaters will start flying March 1st.