The U.S. Center for Disease Control and Prevention (CDC) said on Friday that vaccinated people can travel safely "at low risk" after delaying the publication of new guidelines for weeks.
This removes the guidelines for Americans to avoid all unnecessary travel that has been in effect since the corona crisis erupted in early 2020.
The new guidelines specifically give the green light to grandparents so they can travel by plane to see their grandchildren.
A group representing leading U.S. airlines, such as American Airlines, Delta Airlines and United Airlines Southwest Airlines, called on the CDC on March 22 to publish new guidelines that would include the phrase "vaccinated individuals can travel safely."
Under the new guidelines, people who are fully vaccinated do not need a Covid-19 test before or after travel and do not have to self-isolate after the trip.
However, the US administration has not lifted restrictions on most non-US citizens who have recently resided in China, Brazil, South Africa and most European countries.
Requirements that almost all international visitors present a negative test before arriving by plane in the United States also remain in effect.
The CDC has not changed the guidelines for people who have not been vaccinated against Covid-19.
The new guidelines say that fully vaccinated people do not need to be tested for Covid-19 before an international trip unless required by the destination country, and vaccinated people do not need to isolate themselves after returning from the United States unless required by local authorities.