Air Methods, the world's largest air medical provider, moved its Covington helicopter base to Conyers July 12 to save money and increase efficiency. Benny Atkins, chief operating officer of National EMS, the 911 contracted ambulance service for Rockdale County, said he was glad to have the helicopters back in Conyers. They had been stationed there seven months ago before being moved to Covington when Air Methods and Rescue Air merged.