Milestone, co-founded by NetJets Inc founder Richard Santulli in 2010, owns a fleet of helicopters worth $2.8 billion and has placed orders worth $3 billion. The company’s helicopters are primarily used in offshore oil and gas industries and for search, rescue and emergency medical services. “The addition of Milestone will deepen our domain expertise in aviation and oil and gas, two critical GE industries,” GE Capital Chief Executive Keith Sherin said in a statement on Monday.