WILLIAMSTOWN — Officials at the Mid-Ohio Valley Airport are reviewing three bids to provide Essential Air Service locally. Incumbent provider Contour Airlines submitted a proposal that includes service to Charlotte and the option for another airport, as well as unsubsidized, seasonal flights to Myrtle Beach. SkyWest submitted two bids, one for service to Washington, D.C., or Chicago and one for service to Charlotte. Both companies’ proposed subsidies were lower than the offers they made earlier this year, when they were among five companies that bid on the federally subsidized ...