Alexander MacDonald, 30, of Chelmsford, England, a passenger who yelled and became physically aggressive on a United Airlines flight from London to Newark caused the crew to divert to Bangor, Maine in March. United Airlines Flight 883, left Heathrow Airport near London on March 1 and headed to Newark Liberty International Airport in New Jersey. Several hours into the flight the lead flight attendant heard loud arguing and asked the man to lower his voice, according to an affidavit. He agreed, but minutes later he was yelling again, this time at another flight attendant, the affidavit says. The cabin crew tried to calm MacDonald down but he “would not listen and continued to be verbally and physically aggressive,” according to the affidavit. MacDonald threatened to “mess up the plane,” the affidavit states. He also put his hands on the purser’s shoulders and backed the purser into a corner, the document says. Crew and passengers restrained him in flexible handcuffs. He “continued to be noncompliant” and the flight was diverted. MacDonald has been ordered to pay the airline $20,638 in restitution, according to federal prosecutors. He was sentenced April 25 to time already served, prosecutors said. He had been in custody since March 1, when he was arrested after the flight landed at Bangor International Airport. He pleaded guilty on March 22 to one count of interfering with a flight crew, a felony punishable by up to 20 years in prison.