Sidney–Richland Municipal Airport
Sidney–Richland Municipal Airport is a mile west of Sidney, in Richland County, Montana. The airport is served by one airline, subsidized by the federal government's Essential Air Service program at a cost of $3,777,579.
The Federal Aviation Administration says this airport had 2,031 passenger boardings in calendar year 2008, 2,766 in 2009, and 3,659 in 2010. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a general aviation airport based on enplanements in 2008.
Scheduled air service temporarily ceased on March 8, 2008, when Big Sky Airlines ended operations in bankruptcy. Great Lakes Airlines was given USDOT approval to take over Essential Air Service and flights began in 2009. Between 2011 and 2013, service was provided under EAS contract by Silver Airways. Effective December 10, 2013 service between Sidney and Billings is provided five times per day by Cape Air in Cessna 402Cs.
The first airline flights were Frontier DC-3s in September 1954; a commuter airline replaced Frontier when it ended DC-3 flights in 1968-69, but Frontier returned with Twin Otters and stayed until 1980.
Facilities
The airport covers 335 acres at an elevation of 1,985 feet. It has two asphalt runways: 1/19 is 5,705 by 100 feet and 11/29 is 4,023 by 100 feet.In 2009 the airport had 6,815 aircraft operations, average 18 per day: 59% general aviation, 26% airline, 15% air taxi, and <1% military. 32 aircraft were then based at the airport: 84% single-engine and 16% multi-engine.
Airline and destination
Scheduled passenger airline:Statistics
| Rank | Airport | Passengers | Airline |
| 1 | Billings Logan International | 8,000 | Cape Air |