idreamtofly, welcome to FT. A couple of suggestions. To help FTers determine if they have any interest in your topic and decide whether or not they can help you, a more descriptive thread title is a real plus. A lot of FTers want to help but feel like some of their time is wasted looking at threads whose titles are so vague that they can't make initial judgments of interest.

I've also read your latest post and I must admit I'm confused. I'm not sure what working "in a frequent flyer department" means but I believe most FTers would wonder why you would not have any necessary access to/knowledge about those numbers already at your disposal in such a department. When you start asking about specific beginning numbers and sequences of FF cards some folks will, rightly or wrongly, get a bit suspicious. Especially when you are a newbie and no one knows you. There are lots of reasons why FTers might think that that kind of information could be used inappropriately, even though they might not know exactly how. In this day and age we all can get, as some would say, a little paranoid or, as others might suggest, legitimately cautious.

FTers have no way of knowing your motivation and I fear that your additional explanation won't put suspicious/cautious minds at ease. I have no reason to believe your motivation is less than the curiosity you describe. But it is a very unusual request and I hope you can see why some might be concerned. As I said, most FTers want to help but many of us have been misled or played a time or two as well. And perhaps nothing is more sacred to an FTer than his/her FF information, even if questions are being asked about it in a general sense. So, again, welcome to FT and don't take any of this personally. At least you know you've asked what I think is a truly original question.