Airlines say that simple economics are driving them out of small-town America. With fuel prices high, carriers have been reducing domestic routes and seating capacity to focus on the flights that bring in the most revenue per plane — typically those in larger cities, especially major hubs. At the same time, airlines are removing less fuel-efficient aircraft from their fleets, including the 50-seat regional jets that have been the backbone of air service in small- and midsize markets.

“We just don’t have airplanes that can serve small communities economically anymore,” said Michael Boyd, the president of the air-service consulting firm Boyd Group International. “And unless somebody wants to pay a whole lot of money to carry a few people out of the airport at Thief River Falls, it just ain’t going to happen anymore for a lot of those places.”

One of those places, it appears, is Muscle Shoals, a town of about 13,000 along the Tennessee River in northwest Alabama. About $1.7 million a year in federal subsidies maintains two Delta flights a day from Northwest Alabama Regional Airport in Muscle Shoals, one of the 24 airports Delta wants to stop serving unless it can receive larger subsidies. Those flights are operated under the Delta name on Saab A340 turboprops flown by Mesaba Airlines, a Delta subcontractor.

Barry Auchly, of the Shoals Chamber of Commerce, said that the airport has enough market vitality to justify keeping commercial service. However, he said, passengers have fallen off since Delta decided this summer to redirect its two daily departures to Memphis, rather than to Delta’s global hub in Atlanta where the flights went last year.

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Delta says its flights from the airport are an average of 35.7 percent full, which compares with the national average on Delta’s domestic flights of 81.9 percent in June.