The U.S. is tightening travel rules to and within the country, requiring all inbound international travelers to undergo a COVID test within 24 hours of departure. Additionally, the mask requirement for all domestic flights and public transportation has been extended through March 18, 2022. The measures announced form part of a wider plan to bolster the country's ongoing fight against COVID-19, in particular given the recent uptick in cases following the detection of the newest Omicron variant. To date, at least 23 countries have identified and reported cases, and the World Health Organization (WHO) expects that number to rise in the coming days and weeks. What the New U.S. Travel Requirements Mean The stricter pre-departure testing requirements apply to all international inbound air travelers, regardless of vaccination status. According to senior White House officials, they will come into effect as early as next week. Previously, to enter the United States travelers had to show p...