This was serious enough that people have been detained and the TSA and the airline confirmed the incident.Pilot Union Security Report wrote:On a Sept. 2 flight from Reagan National Airport in Washington to Orlando, a "Middle Eastern" man rose from his seat and sprinted toward the cockpit, before veering sharply to go into the forward restroom, according to the memo. While he was in there, sever other men moved about the cabin, changing seats and going into overhead bins, it says.
It seems they may be working on tactics to quickly identify the air marshals on a given flight.
Stay vigilant!