6 alphanumeric, case insensitive characters only allow for about 2 billion uniqu... | Hacker News

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		lxgr 1 day ago \| parent \| context \| favorite \| on: Reverse Engineering US Airline's PNR System and Ac... 6 alphanumeric, case insensitive characters only allow for about 2 billion unique combinations. I’d have guessed there were more reservations made than that? Or are PNR locators recycled after a while?

bleepblap 1 day ago [–]

Yes, I've got in my drawer two physical boarding passes with the same PNR

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