More countries have joined the UK in curbing travel to the Egyptian resort of Sharm el-Sheikh, amid fears that a bomb brought down a Russian plane on Saturday, killing all 224 on board.
France, Belgium and the Netherlands warned their nationals not to travel, and German airlines cancelled flights.
UK airlines will start to repatriate tourists on Friday, but with hand luggage only.
Militants linked to Islamic State (IS) have claimed they destroyed the plane.
"We brought it down by God's help, but we are under no obligation to reveal the mechanism we used," IS affiliate Sinai Province said in an audio statement circulating on social media on Wednesday.