A number of European countries have warned that it is too early to plan for Christmas travel, as coronavirus cases continue to rise across the continent.
In Sweden, people have been told to prepare for possible travel restrictions during the holiday period. Meanwhile Irish and French authorities say it is too soon to say if people could make travel arrangements.
With six weeks until the festive season, lockdowns and other measures are in force in several countries.
Portugal has significantly expanded the number of places subject to a night curfew.