Just get closer to someone behind a ck-in desk at the airport (even abroad) and you get all the magic numbers.
You don't even have to get closer to them, just explain the situation and ask, they will tell you. Try at first and business class check in or staff travel, they know how to use black screen and read info from it. You can even approach to any supervisor (any check in area) and ask, they will tell you.
It's not difficult to get that info. Problem is - now anyone can, actually, sell the info and many will try.