https://phys.org/news/2018-07-thomas-cook-seaworld-holidays-animal.html

"We have also taken feedback from our customers, more than 90% of whom told us that it was important that their holiday company takes animal welfare seriously," he added, confirming that tickets to such attractions will no longer be sold from next summer.

Animal welfare concerns over the treatment of orcas in captivity have been amplified since the critically lauded 2013 documentary Blackfish, which argued that the highly intelligent animals are psychologically traumatised in tourist attractions such as SeaWorld.