pilots refuse to fly with gun loons onboard

"Some flights to the US could be grounded after the airline pilots' union
called on its members not to fly with armed sky marshals on board."

"Airline pilots should not take off with marshals on board, the British
Airline Pilots' Association (Balpa) has said."

"Capt Granshaw defended pilots' right to take action and said: "Our advice
to pilots is that until adequate written and agreed assurances are received,
flight crew should not operate flights where sky marshals are carried."

http://news.bbc.co.uk/1/hi/uk/3357309.stm