I've had a boarding pass reissued at the gate based on my passport. Some airlines in Europe check both the boarding pass and the passport/identity card at the

I've had a boarding pass reissued at the gate based on my passport. Some airlines in Europe check both the boarding pass and the passport/identity card at the boarding gate, to ensure people haven't swapped boarding passes within the airport. I think I see this on flights outside the EU, but I'm not sure.