I found a registration error for a UAL 777 at SEA on October 10, 2003. It is listed as N785UA when it is actually N784UA. I do have photographic proof, with EXIF data. What do I do? DO you think this deteriorates the credibility of BTS?
It is much more likely that both N784UA and N785UA were at SEA on that day. United usually has one 777 come in from Tokyo and depart for Chicago. Another flies the reverse route (I believe the US city is ORD, but I am not certain). UA easily could have aircraft with consecutive registrations operating the two flights.