The Federal Aviation Administration is cracking down on unruly airline passenger behavior.

So far 37 incidents out of227 initiated enforcement caseshave been sent to the FBI, according to theAssociated Press.

The FAA hasn’t indicated how many of the referrals have led to charges.

The agency didn’t immediately respond to CNET’s request for comment.

Warning for unruly airline passengers!

We are referring the most egregious cases to the@FBIfor federal criminal prosecution consideration.

This is a priority for both agencies.

Learn more athttps://t.co/ISiblzAzGi.

He currently faces up to 20 years in prison for assault and interference with a flight crew.