to North Dakota as well as the replacement of its Fairchild Metroliner propjets with Beechcraft 1900D turboprops with the latter being leased from Mesa Air Group subsidiary Air Midwest. Service from Sheridan, Wyoming to both Denver and Billings began by the end of 2005 but was then terminated in January 2008. In February 2006 Big Sky began daily service between Walla Walla Regional Airport and Boise (BOI). Service ceased with the airline's bankruptcy in 2007. In July 2006, Big Sky announced that the airline would discontinue service to Great Falls, Montana; Kalispell, Montana; and Spokane, Washington. The airline also announced that one of their Beechcraft 1900D's would be leased to Chalk's International Airlines in Florida. On September 1, 2006, Big Sky discontinued service to Moses Lake, Washington. On December 21, 2006, a press release announced that Big Sky would become a Delta Connection carrier via a code share agreement with Delta Air Lines using eight Beechcraft 1900D turboprops operated from Boston's Logan International Airport (BOS). The airline's east coast operations ended on January 7, 2008. Closure On December 20, 2007, Big Sky announced that it would more than likely cease operations within 60 to 90 days. This was due to the loss of the Delta contract, unusually bad weather, disappointing revenue and record-high fuel prices. The remaining Beechcraft 1900D aircraft were planned to be auctioned off and proceeds returned to MAIR holdings stockholders. In late 2007 Great Lakes Airlines was given USDOT approval to take over EAS service to and from Billings, Montana and seven other Montana cities currently served by Big Sky. Great Lakes Airlines began flying the routes in 2009, only to be replaced with Gulfstream International Airlines (now named Silver Airways) by the Montana Essential Air Service Task Force in January 2011. The Montana routes were replaced once again by Cape Air on December 10, 2013. Big Sky's final scheduled flights arrived in Billings on the morning of March 8, 2008; that morning, the three final flights marked the end of the airline by performing a joint flyover of the Billings airport prior to landing. The airline's website, www.bigskyair.com, has been deactivated. Destinations: Western and Central U.S. Big Sky served the following destinations at different times during its existence. Destination information is taken from various Big Sky Airlines route maps: Arkansas El Dorado Harrison Hot Springs Jonesboro Mountain Home Colorado Denver International Airport Idaho Boise Airport Idaho