Chief of the LaMia company is being detained as part of an investigation into an airline crash that killed 71 people last week.
The plane - which was part of the LaMia company - was flying to Colombia when it ran out of fuel. Now the company's chief is being detained as part of an investigation into what happened.
A member of staff also says she warned the pilot about the problem before take off. She's since moved to Brazil due to safety reasons because she says she's received death threats.