The Keeping Up With The Kardashians star logged on to the micro-blogging website after boarding a plane in New York and told fans she was seated next to a top secret agent - whose identity is concealed to ensure the safety of fellow passengers.
She wrote: "I'm on the airplane...love wifi. I am sitting next to an Air Marshall (sic)! Jim the air marshall (sic) makes me feel safe!"
Kardashian's 'tweet' sparked fury among some of her followers, who raised concerns about the star exposing such privileged information.
But Kardashian brushed off the criticism and defended her air companion, whose full name was not revealed.
She responded: "RELAX I just told u guys the Air Marshall (sic) is sitting next to me, highly doubt anyone is twittering like me on this flight! Shhh.
"Air Marshall's (sic) are supposed to keep their identity concealed. He did! I am just a private eye & assumed, so I asked him & he was honest!"