On Monday, after more than 18 months, restrictions that kept families separated and cost the global travel industry hundreds of billions of dollars were lifted.

The United States reopened its borders for vaccinated foreign travelers on Monday, ending more than 18 months of restrictions on international travel that separated families and cost the global travel industry hundreds of billions of dollars in tourism revenue.

Before dawn on Monday, thousands of excited passengers flocked into Heathrow Airport for the first flights to the United States out of London. They were welcomed by dozens of airline staff who beamed and waved American flags as they ushered guests toward designated areas for documentation and security checks.

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