Thank you all for your warm welcome!

With regard to the first question thrown, the information will be used at work. I am assigned to a frequent flyer department and I need to know at least what are the "conventions" of each arline frequent flyer program. It is not really crucial at all to know but I just got so curious about it. There is a little I know:
Skymiles - 10 digits
AAdvantage - (new) 7 characters, alphanumeric
KLM - starts with 1, 2, 3, or 4.
UAA - 11 digits
USA - 7 characters, alphanumeric
Airmiles - always starts with an "8", 11 digits long

I was able to see a list before but I don't remember where. I kept browsing the net trying to find something but I still am unsuccessful. =)

THanks again and if you happen to find one or a website that might be of help, kindly let me know.

Enjoy the rest of the day! =)