An outdated sign requiring Delta Air Lines passengers to wear a face mask to board a plane is displayed in the domestic terminal of the Hartsfield-Jackson Atlanta International Airport after Biden’s administration announced that it will no longer enforce a U.S. mask mandate on public transportation, following a Florida court ruling, in Atlanta, Georgia, US. (REUTERS)Canada on Tuesday said it will keeping the mask mandate in place for public transportation, including airplanes, for the forseeable future, despite a similar rule being dropped in the US.