We flew to New York from Portland. On the day of our flight we did a self test at home, just in case it came back positive and there would be no point flying to New York. Phew, the tests were negative, so off we went to the airport and did an official rapid antigen test at the airport testing site - it was sponsored by Carbon health. We had made an appointment beforehand, so it was very easy to just walk up, get our noses and lower brain probed, and we had the results by email in a few minutes. We flew to New York, and printed up the results in the business center at our hotel. It was all quite simple. The agent in Brooklyn seemed quite OK with the print out of the results. We had hoped to do the testing at our local Walgreens, but they only did PCR testing, not rapid antigen.