Haslett, who joined Celestyal in February 2023 from Virgin Atlantic, will leave the line in October. A search for his successor is under way.
Celestyal said Haslett had played a key role in its commercial transformation, leading on strategy across revenue management, sales, marketing, partnerships and distribution.
Haslett said the opportunity to join "a globally recognised sporting institution at such an exciting time in its journey" was one he could not pass up.