Flying DCA-ATL back in Oct. and learned, from my seatmate, that Ivanka Trump was on the flight. I thought she had taken my upgrade, but later learned that she was in the very back of the bus! I waited at the gate when disembarking and, sure enough, she and her secret service agents(3-4) were the last ones off the aircraft. Tried to follow them down the concourse, but lost track. Imagine my surprise, when arriving at the B Concourse SkyClub, I saw the same agents and, of course, Ivanka again. I didn't ask where she was going, but did notice that she had changed from a casual outfit into, what appeared to be, a Hermes dress.