Thomas Cook Group (TCG) said in a trading update that overall bookings are down by 4% but remain in line with its expectations.
"Excluding Turkey, bookings are up by 8% across the Group as a whole, while including Turkey, bookings are down by 4%," the company said of current trading.
"Sales have been driven by demand for high-volume destinations including the Balearic and Canary Islands and the USA, alongside smaller destinations like Bulgaria and Cuba.
"Our Summer 2016 programme is 89% sold for the Group, 3% below the same period last year."
CEO Peter Fankhauser added:
"The Summer season has progressed largely as expected. Customers' desire to go abroad on holiday has remained strong with the exception of Turkey where demand continues to be volatile.
"To date, sales for the Winter season are in line with last year while sales so far for Summer 2017 suggest that customers are booking early in an effort to secure their first-choice destination and hotel.
"We remain focused on ensuring that we have the right holidays available in the most popular destinations in order to meet changes in customer demand. At the same time, we continue to transform our business for profitable growth.
"We've taken big steps forward in recent months with the agreement of a new hotel sourcing partnership with Webjet and the launch of Thomas Cook China. However, we're particularly proud of the improvements we've delivered in customer satisfaction thanks to the work we've done to strengthen the quality of our offering.
"We know that the increased loyalty we get from happier customers is key to driving the future success of our business."