1:02 PM PT -- Frontier Airlines tells TMZ ... the passenger made inappropriate physical contact with 2 flight attendants and physically assaulted another flight attendant.
The airline says the passenger "needed to be restrained" until the flight landed and police arrived. Frontier says it's working with law enforcement to prosecute the passenger, and the airline says the crew members' paid leave is line with their policies and an investigation is pending.
A few flight attendants are temporarily relieved of duty after their bosses at Frontier Airlines deemed that duct taping an unruly passenger to his seat might have crossed a line.
Check out this insane video that was captured Saturday on a Frontier flight from Philly to Miami ... in which a young guy is seen losing it on passengers, yelling at them that his parents are worth $2 mil and other bizarre ramblings. He's cussing out the flight attendants as well, who were trying to calm him down.
Eventually, he gets into a scuffle with a male flight attendant ... and he's finally restrained to a seat with a ton of duct tape. The rest of the passengers were cheering his detainment.
As for what exactly led up to all this ... the guy's name is Max Berry, and he reportedly emerged from the lavatory shirtless after he'd spilled a drink on himself. As some attendants helped him get a new shirt from his bag, he allegedly went around groping some female attendants' breasts, and things escalated to where the clip starts.