The U.S. has been monitoring for the coronavirus in wastewater since the CDC launched its National Wastewater Surveillance System in September 2020. But that testing mainly involves wastewater from households or buildings, not samples from airports or planes.
Long story short, you are likely contagious for about 10 days after symptoms begin. You should isolate for the first five days and wear a mask on at least days six through 10.
A US military study suggests that people who are unvaccinated against COVID-19 and those with moderate or severe infections are at significantly higher risk for persistent symptoms for 1 to 6 months.
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