Another thing.... airline gate agents will become the arbiters of which documentation is acceptable. So if I present a PCR test that I purchase on the island, is that good enough? If I present documentation of a positive test and recovery (a letter from my healthcare provider), does the gate agent decide whether this is acceptable?

This can't stand as it is written. I'm gonna shut-up now, before I get into a political diatribe about the workings of the CDC ...