Just heard it a few seconds ago. Tower noticed white vapour coming off the wing of a rotating Mexicana (MXA3) airplane heading for MMMX. Confirmed by other planes, smell of kerosene. Folowed by ATC being scolded by a pilot for a bad joke("that was a cheap shot") and the controller's childhood story about growing downwind from New Jersey. Some taxiways closed, GRND busy. Airplane continued on route, though someon on freq mentioned it'll stop over in Houston.