You may find that it's particularly difficult to get police onto the plane to arrest the people who are beating the crap out of each other and take them down to

You may find that it's particularly difficult to get police onto the plane to arrest the people who are beating the crap out of each other and take them down to the station if the plane is in the air. An in-air brawl is obviously dangerous for the participants, but also anyone nearby who might catch a leg or elbow, or for the flight crew whose job descriptions don't include physically restraining violent passengers.