A flight from Thailand to China returned to Bangkok after a passenger assaulted a flight attendant by throwing hot water at her, airline officials said.
A statement from Thai AirAsia said the Chinese passenger on a flight to Nanjing berated the crew member before scalding her with the water.
The airline said colleagues gave the injured woman first aid while the pilot returned to Bangkok and removed the passenger and her entourage of three others from the plane.
The statement said a discussion between the crew and the ejected passengers at the airline's office resolved the situation amicably, but did not say if the four passengers were allowed back on the plane when it departed again.
Chinese media reported that instant noodles were thrown along with the hot water.
In a video posted on the internet by China National Radio, a man was also seen standing up in the cabin, making a threat to bomb the plane. The airline statement did not mention the bomb threat.
Incidents involving angry outbursts by Chinese tourists have prompted Beijing to issue guidelines on behaving abroad.
In February, according to Thai and Chinese news reports, 27 members of a Chinese tour group were ejected from a China Eastern Airlines flight before take-off from the Thai resort island of Phuket after brawling over seating arrangements.
Chinese visitors represent the biggest share of tourist arrivals in Thailand.