Well, you never know I guess huh...I just can't believe they would do it so blatantly, if that was the reason. Seems VERY out of character for any airline I have ever flown....I would have freaked on them if I were one of those passengers, how humiliating!
Is it possible one was a cop and the other a prisoner he was transporting? Because the cop may have been armed- that could have been a reason they had to ID themselves too. (I used to be a screening guard and we had them come through all the time...wait- this was a vacation charter? nevermind

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