So if you have a flight on a Sunday at 3pm....is this an exact 24 hour time period where you need to test at Saturday no later the 3:00 on your covid test? I am the assuming you should test at 1 or 2:00 the previous day (Saturday in this example) to be safe. But what happens if your flight if delayed several hours putting your covid test several hours past the 24 period in this case? We all know flights can get delayed back to the states in the winter. Is the test no longer valid? Am I crazy for asking about this scenario?