Stockshots of planes from US airlines and people wearing masks at airports, as major airlines drop their mask requirements after a US federal judge struck down the Covid-19 mask mandate for public transportation imposed by the administration of President Joe Biden. After the ruling was announced, United Airlines dropped its mask mandate on domestic flights and some international flights, depending on the rules in the country of arrival. It was soon followed by American Airlines, Delta Airlines and Alaska Airlines, who all made masks optional for crew members and customers on domestic and most international flights. STOCKSHOTS