I was out running errands around IAD this afternoon, and around 240, I saw an all-white A340-300 land. Flightaware has no records of this plane landing, and the IAD flight schedules only list 2 A340s- the AF and IB- both of which arrive around 4pm. The OS93 arrival is scheduled around 220, but I had thought OS had disposed of their A340 fleet. Does anyone know the identity of this mystery bird? Thanks in advance.