After staying home virtually all of 2020, in the Spring of this year I started traveling again. In May I ventured an international trip, accepting an invitation to speak at a Europe Teen Challenge conference in Portugal. At the airline gate, twenty minutes before departure, I learned that my COVID-19 antigen test, required for travel, was valid for my connection through Germany but not for entering Portugal. United Airlines pulled my suitcase off the plane, issued me a hotel voucher ...