Arsenal manager Arsene Wenger said if a football manager goes "overboard" on the touchline they should be "punished".
"The rules are the rules", he added.
More top news
Police found an 18-year-old man who had been stabbed. The London Ambulance Service was called but was unable to save him.
The incident is believed to have taken place on Ryanair flight FR015 at Barcelona Airport on October 19, before it left for London Stansted.
Tommy Robinson could be sent back to jail if he is again found in contempt for filming people in a criminal trial and streaming the footage.