answers: in late 2011
context: a single round-trip ticket on Mesa Airlines flights. Air Midwest Air Midwest, Inc., was a Federal Aviation Administration Part 121 certificated air carrier that operated under air carrier certificate number AMWA510A issued on May 15, 1965. It was headquartered in Wichita, Kansas, United States, and was a subsidiary of Mesa Air Group. Besides initially flying as an independent air carrier, it later operated code sharing feeder flights on behalf of Eastern Air Lines as Eastern Air Midwest Express, on behalf of Trans World Airlines (TWA) as Trans World Express and on behalf of US Airways as US Airways Express. It </s> Midwest Airlines Midwest Airlines (formerly Midwest Express) was a U.S.-based airline and, for a short time, an operating brand of Republic Airways Holdings based in Oak Creek, Wisconsin, operating from Milwaukee's General Mitchell International Airport. On April 13, 2010, parent company Republic announced that Midwest Airlines and Frontier Airlines would merge, with the Midwest brand disappearing in late 2011. Midwest Airlines' final flight operated with a Boeing 717-200 and staffed with Midwest Airlines flight crews landed in Milwaukee on November 2, 2009. Effective November 3, 2009, Midwest Airlines ceased to exist as an actual operating airline (allowing its DOT air </s> America West and US Airways in 2007. Air Midwest further operated as US Airways Express at the major carriers' hubs in Charlotte, Philadelphia, and Pittsburgh and with smaller operations at Omaha, Little Rock, and New Orleans. On January 8, 2003, Air Midwest had its first fatal accident when Air Midwest Flight 5481 operating as US Airways Express and departing out of Charlotte for Greenville-Spartanburg crashed 37 seconds after takeoff. All 19 passengers and two crewmembers were killed in the accident. For a period of three weeks in August 2006, Air Midwest operated as Delta Connection, flying three Beechcraft 1900D from
question: when did midwest express go out of business