Originally posted by jetwet1
Seeing as this has been posted on the web many times im not letting any secrets out.
The way I used to spot them was they would board with the crew,dressed in regular clothes and would be seated in first waiting for everyone else to come aboard,pretty conspicuous.
They've never been very good at incognito - unfortunately stiff security officers always stick out. And when they try to go casual even more so. Having lived in Brixton I can tell you it is as easy as pie to spot an undercover police officer, I'm sure regular flyers can do the same on a plane!
As to safety and security, I'm in the camp of believing an armed marshall increases the threat rather than decreases it - if action is needed you just don't know who's behind him/her ready to take them out and the take the gun ... agree with Fozzyo and the BA comments, if there is a threat at all, take everyone off for secondary screening, don't let anyone who doesn't pass 100% back on, or cancel the flight as BA have done a number of times. Leaving a threat in place and adding arms to it in flight is madness in my mind.
Thankfully the whole security situation is so much better than it was and that must give cause for comfort.