So I booked a few connecting flights using AI own website. Seems AI provides you only with their own 5 digit PNR number, which is useless to try uaing anywhere else then the AI website. I'm looking at trying to upgrade with Optiontown amongst other things, but I need the 6 digit booking number for that.

Called AI customer service but they were less than helpfull and referred only to the 5 digit PNR issued and used by AI themselves.

So how does one go about retrieving the 6 digit one?