When you travel?

Both, depending

, both 

I do not travel at all in my life.

both probably since with my luck i would loose/forget my the physical one or break/loose my phone!

Mainly an electronic ones, most European airlines use electronic. So I’m used to electronic but I don’t mind both.

Oh.ok, I use both, but nower days things are services and products are getting more and more on the Internet. So I often use digital boarding pass and digital tickets.

I use both.

When I travel I use a physical pass