Unable to get the new airfield it needs, the U.S. Navy is considering renting runways at public and private airports in Virginia to accommodate the practice flights of some aircraft. Naval officials have tried unsuccessfully for years to build new landing strips for Fentress Naval Auxiliary Landing Field in Chesapeake, where pilots of E-2C Hawkeyes and C-2 Greyhounds prepare for nighttime aircraft carrier landings. But local residents have opposed the expansion because of concerns about plane noise.