It was about 15:25 on Mon 4th, so if it was on schedule it may have been Flight AA57 from Miami or possibly AA67 from Chicago running late.
I was watching from T1 Gate 5.
After exiting the runway and while waiting for another A/C to clear the taxiway the Captain's window was opened and the Stars and Stripes were stuck out. It looked like the flag was clipped to the window or supported in some manner as the staff remained upright as the A/C continued taxiing.
Not a drama just curious as in quite a few years of hanging around airports I have not witnessed this before.