Travel technology companies are developing health passport apps to allow travelers to verify test results or vaccinations for international flights.

Tech firms, industry associations and airlines around the world have been developing and trying out different digital passport options to ease the process of complying with COVID-19 health requirements for travel.

SITA, a travel technology firm with its U.S. offices in Atlanta, said Thursday it has started trials of technology enabling airlines and passengers to share COVID-19 test results or vaccination history with authorities to meet government requirements. It has tested it with travelers to the United Arab Emirates and plans for a trial at Malpensa Airport in Milan, Italy.

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