Travel giant Tui reports that holiday bookings for Tunisia have dropped so much that it has cancelled its programme.
It has stopped flying to Tunisia and Sharm el-Sheikh in Egypt because of security concerns.
The Anglo-German tour operator also revealed it had experienced “a significant shift in demand away from Turkey”, with bookings slumping by 40%.
Holidaymakers are opting instead for destinations which they believe are safer, namely Spain and the Canary Islands, Portugal and Greece.
Last month, 11 German tourists died in a suicide bombing in Istanbul in the latest outrage in the country. Turkey had been a popular destination for Germans.
Last October, a Russian airliner crashed after leaving Sharm el-Sheikh and in June sunbathers were attacked in Tunisia.
Like most travel companies, Tui relies on the summer season to turn a profit. It said it expects not to be harmed by the changes as it will benefit from customers switching to other destinations.
For long-haul destinations, Tui said there was a marked increase of 10% for bookings to places such as Cape Verde and Mexico and strong growth for Caribbean spots, particularly the Dominican Republic and Jamaica.
Tui is the largest leisure, travel and tourism company in the world. It owns travel agencies, including Thomson and First Choice, as well as hotels, six European airlines, and cruise ships.