Paris Hilton's brother Conrad Hilton checked into rehab immediately following his arrest for trying to kill the crew of a flight from London to Los Angeles.
Conrad Hilton was arrested and appeared in court yesterday after surrendering to authorities investigating a bizarre incident ... that took place last July.
Hilton, 20, allegedly berated and threatened the crew during the British Airways flight from London to LAX, causing an epically disruptive scene.
Conrad told federal officials he had taken a sleeping pill before boarding, and his attorney (THE) Robert Shapiro says that could've caused the outburst.
Sources close to the Hilton family also say that Conrad voluntarily checked himself into a 30-day inpatient drug and alcohol treatment center afterward.
Hilton was released on $100,000 bail at Tuesday's hearing, during which he was ordered to turn over his passport and remain in the state of California.
According to witnesses, he repeatedly threatened to "f--king kill" the flight staff and stated that he will "own" all of the "f--king peasants" on the flight.
The tirade was so bad that kids on the flight were in tears, and one of the crew members decided to handcuff him to his seat after he passed out.
While restrained, Hilton woke up, grabbed a flight attendant's arm and screamed, "I could get you fired in five minutes. My father will pay this out."
"He's done it before. Dad paid $300K last time," Conrad boasted.
It's unclear why this incident only led to his arrest months later.
As for his sister ... you gotta check out Paris Hilton's Instagram photos lately. She's trying to cause a whole different kind of scene. If you know what we mean.