I’m even older school.

I carry paper copies of all travel related documents, for those times when you’re failed by IT, and, more often than not, I use them as my primary source when required, with the phone as the backup. This is particularly the case at boarding gates or train stations when you typically have to juggle cabin baggage in one hand while presenting documentation with the other.

Perhaps it’s because I’ve spent my entire career working in technology and know its limitations and frustrations.

Like those times when your phone crashes / loses connectivity / runs out of battery / locks itself out for five minutes at the most inopportune moments.