According to the Austin PD, Scantlin got into a verbal argument with a flight attendant over alcohol. It's unclear exactly what provoked the argument, but a source with airport security says Scantlin was upset because the flight crew wouldn't sell him booze.
Scantlin's flight was originally bound for L.A. but was re-routed to Bergstrom International Airport in Austin for an emergency stop, where Scantlin was booted from the plane.
A rep for the Austin PD tells us, Scantlin was arrested and booked for public intoxication, but he could also later face federal charges of interfering with a flight crew.
FYI -- Scantlin pled "guilty" to felony cocaine possession in July, but the judge agreed to clear his record in 18 months so long as Scantlin obeys all laws ... a condition Scantlin may just have violated.
Bottom line -- if Scantlin actually did cause a mid-air ruckus he could face prison time for the cocaine charge, as well as for public intoxication and interfering with a flight crew.