[Catalyst] Confirmations numbers for Humans

[Karl.Moens at marsh.com]

If we assume that the format of the confirmation number matches 
/[A-Z]{2}[0-9]{4}/, this still gives you 6,760,000 possible combinations, 
which seems large enough to avoid collisions even one recycles the 
key-space every few days. Any duplication can easily be solved by asking 
one extra detail such as departure or destination or (what an idea!) the 
name you gave when making the booking. The combination of such a short 
number and one extra item would defeat any "guessing" by J. Random Hacker.

Karl
aka CountZero at Perlmonks




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