How Cargo-Only Passenger Planes Are Getting Vaccines Beyond U.S.

United Airlines has been flying vaccines on cargo-only flights for months. Now, as vaccinations slow in the U.S., more doses are headed overseas.

United Airlines isn't used to operating like a cargo airline. But since early 2020, part of its operation has been doing something pretty close. Now, as the industry eyes a comeback to international travel, all that cargo, including vaccines, could welcome company in the hold: suitcases.