Peta said a group of its activists, including two posing as chained orcas, would protest outside the AGM, while representatives from the organisation would attend to speak to shareholders and executives to "openly call for the company to end its promotion of marine parks and ticket sales for the exploitative facilities".

A Jet2 spokesperson said: “We are aware of the debate surrounding such venues, and while there continues to be high customer demand, we recognise how critical it is that animal welfare standards are adhered to.

"It is important to note that we are committed to only working with venues that agree to uphold the highest standards. We are of course willing to engage with organisations on this matter in a respectful and constructive manner."

Peta said its actions and those of other animal rights advocates had encouraged some of the world’s largest travel companies, including Expedia, TripAdvisor, Virgin Holidays, British Airways Holidays, Club Meb, Airbnb and Booking.com to stop selling tickets for attractions keeping whales and dolphins in tanks.

“Most UK travel companies have done right by animals by cutting ties with facilities that exploit captive orcas and other dolphins – Jet2holidays must get with the times and follow suit,” said Peta vice-president Elisa Allen.

“As a shareholder, Peta will be able to push Jet2’s management to do the responsible thing for shareholders and animals alike and stop profiting from marine mammals’ misery."