Douglas County commissioners are to consider Thursday a five-year contract with ABS Aviation Management Services to run Minden-Tahoe Airport that officials say will save $240,000 over the life of the agreement.County Manager Steve Mokrohisky said the contract would cost $412,000 the first year with a 3 percent annual increase the next four years."The Minden-Tahoe Airport is the only financially self-sufficient general aviation airport in Nevada," Mokrohisky said Monday. "That means no general tax dollars subsidize the airport operations. It's fully funded by fees collected by airport businesses and users."He said airport manager Bobbi Thompson and her staff had support of …