It has had two planes seized by the agency this year.
The man widely believed to be behind the aviation company is an ex-convict named Christian Esquino who has a long and checkered legal past, including convictions for fraud, one as part of a sweeping drug investigation in Florida in the late 1980s.
The 43-year-old California-born Rivera died when the plane she was traveling in nose-dived into the ground while flying in Mexico Sunday morning.
Associated Press writers Elliot Spagat in San Diego and Ken Ritter in Las Vegas contributed to this report.
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