[ninalanyon]

In Norway on Norwegian carriers all you need for internal travel is the credit card you booked the ticket with.

[shellfishgene]

No ID? So anyone with the card can use the ticket?

[eqvinox]

That's normal in the Schengen area, you only need ID if you're checking a bag. (Or if there's a spot check by police, but they won't care if your boarding pass matches your ID, just that your ID is valid.)

[extraduder_ire]

If they're for sale online, anyone with the card can buy another ticket.