That sounds like a real long shot. How fast are test results now?If they give you 72 hours, it might be possible to get tested before you leave the US and have the result still be valid when you return. Just have to shorten the trip tp 48 hours. This doesn't look like it will slow down covid in the US at all, however, the airlines should make some money with this plan. Consider it a small government bail out, paid for by the passengers.