That’s not been generally true for at least the latter half of this year. They ask for the Amex Plat/Centurion cards and a same-day boarding pass, at least very often.

I have used the Pontus facility on arrival — it’s my main use of the lounge — but they now always ask me for a boarding pass for info to to scan/load into their system beyond just asking for the Amex Plt/Cent cards (as used to be their habit).

Out of my last twelve visits to the facility, I’ve been asked for the boarding pass each and every time. Of those visits, most were on days when I only had a same-day arrival into ARN but no same-day departure out of ARN.

Of the access requirements listed by Amex for this facility, the only one of the three requirements they don’t ask for in my experience is the one about ID.

One negative thing about the Pontus in the Air lounge — and one not to be encountered at the other Arlanda lounges — is that you cannot get your own beverages and have to wait to be served even for regular water. So if you want a quick glass of water or anything else to drink, you may find Pontus in the Air is too slow with its service whether or not the lounge is busy.