Insurance giant AIG contends that the former head of its aircraft leasing business, L.A. billionaire Steven Udvar-Hazy, wooed away customers and pilfered business deals after he started competing firm Air Lease Corp.Troubled insurance giant American International Group Inc. filed a lawsuit against the former head of its aircraft leasing business, Steven Udvar-Hazy, contending the Los Angeles billionaire stole company secrets, wooed away customers and pilfered business deals after he started a competing firm in 2010.