In terms of rapid testing, my understanding is there are two kinds: PCR, which is slow but accurate and expensive, and antigen, which is quick, inaccurate, inexpensive and only catches symptomatic cases. Until that changes, you either show up to the airport 6 hours early for an expensive PCR test or you take a test that doesn't catch those you're really concerned about: asymptomatic patients. This shouldn't give one confidence that they won't be stuck in a small metal tube for hours with typhoid Mary in the form of a hungover frat boy. Government guidelines aside, rational people could easily decide not to fly to Disneyland or take a business trip.