Did not fly Sprint but no one asked for any proof of negative test or if vacinated. Arrive early though because TSA lines are very long.
Depends on where you are going. Check the website for your destination. I know you need to show proof of a negative test for the US Virgin islands.
No. You do not need a negative test or proof of vaccination within the US. You must wear a mask over your nose and face at all times.
Not necessary to travel just wear mask
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