Speaking of lighting open fires in the cabin some airliners remove the seats and can carry many more passengers than would normally be carried. While working in Iran, I was dating a Flight Attendant from Lufthansa. She told me about not only the seat removal but she also indicated that the Muslim passengers had no idea how to use the Western style toilets on the aircraft. After totally contaminating the toilets they selected a common area at the back of the cabin and used that as a communal toilet. The stench was so bad that the crew crowded onto the flight deck or the upper deck and went on Oxygen. When the plane returned to Frankfurt they took it out of revenue service and stripped the aircraft completely down and cleaned it up and treated the inner skins and structure for corrosion.