Originally Posted by
daisyatl
Vax rule was also only for air for awhile. Interesting that never expanded the testing as well beyond air.
It's because you can't deny entry to US citizens at the border. It just wouldn't be legal. Getting on a flight is not the same as presenting yourself at the border, therefore it's legally possible. Plus, the border delays it would cause would be even bigger... Airports are easy since people already arrive hours early for other document checks.