I would guess so. My last (cross border) flights in Europe were with airberlin, Ryanair and easyjet and I had to provide ID while boarding in together with my t

I would guess so. My last (cross border) flights in Europe were with airberlin, Ryanair and easyjet and I had to provide ID while boarding in together with my ticket, and at checkin because I showed up without a physical ticket, so they needed some way to verify I was the one who had paid for the ticket. I never showed any ID to the police, customs, immigration, or anything like that.