US airlines fined for stranding travelers on plane

* First-ever fines for stranding passengers

* Airlines reach settlement with regulators

* 47 passengers left on plane for nearly six hours.

WASHINGTON, Nov 24 (Reuters) - The U.S. government on Tuesday imposed its first-ever punishment against airlines for stranding passengers aboard aircraft, fining three carriers $175,000 for a six-hour ordeal in Minnesota.

Continental Airlines (CAL.N: 行情) and its ExpressJet Airlines (XJT.N: 行情) affiliate were fined $100,000, while Mesaba Airlines, a unit of Delta Air Lines (DAL.N: 行情), was fined $75,000, the Transportation Department said.

Continental, ExpressJet and Mesaba all reached settlements with the government's Aviation Enforcement Office.

The action served as a sharp reminder to carriers about service just as the busy Thanksgiving Day travel period gets under way.

Regulators found all three airlines violated a law prohibiting unfair and deceptive practices for their roles in the Aug. 8 incident in Rochester, Minnesota.

Forty-seven passengers were stranded overnight aboard a Continental Express plane en route from Houston to Minneapolis that diverted to Rochester due to bad weather.

ExpressJet operated Flight 2816 for Continental while Mesaba was the only airline staffing the Rochester airport at the time. Mesaba refused to let passengers exit the plane and enter the terminal because there were no federal security personnel on duty at the time.