Flight attendant unions in the U.S. are concerned about pro-Trump activists on commercial flights.
Politically motivated disruptions on flights have escalated following the riots at the country's Capitol building.
Two onboard disruptions were reported in Washington D.C.. One of those incidents involved people on a Delta Air Lines flight chanting "traitor" at Republican Sen. Mitt Romney - who was a passenger. Delta said the flight crew resolved the situation.
"The mob mentality behavior that took place on several flights to the D.C. area yesterday was unacceptable and threatened the safety and security of every single person on board," the Association of Flight Attendants-CWA said.
The union - with more than 50,000 members - said that the riot at the Capitol had created "further concern" over the safety of passengers and crew departing from the D.C. area. The union said acts against the government made by protesters should disqualify them of their freedom of flight.
Earlier in the week, a heated dispute occurred on an American Airlines flight to Dulles International Airport. Witnesses said two groups shouted and cursed each other during a politically fueled argument. Flight attendants were forced to order passengers back to their seats.
American Airlines said it was investigating. The company added that it applauded the professionalism of the crew who de-escalated the situation.
American Airlines said it was taking precautionary measures to ensure the safety of passengers and crew. This includes temporarily banning alcoholic drinks on flights to and from Washington as well as increasing crew members.
The Association of Professional Flight Attendants - representing more than 25,000 members - said political beliefs shouldn't be used as an excuse to cause trouble. The union said commercial flights must be a "calm environment" for safety reasons.
The two unions said airlines should have a "zero-tolerance policy" for these incidents. Those that interfere with the duties of the crew need to be arrested or fined, the unions said.
