Numerous airlines offer the opportunity to donate to climate projects or tree plants when booking a flight. However, this “indulgence trade” is a slow-moving industry-wide. According to CEO Michael O'Leary, less than one percent of travelers use this option at Ryanair.

The low-cost airline is by no means at the lower end of the spectrum, because even its competitor Lufthansa succeeds in persuading very few passengers to donate to the in-house organization Compensaid, despite the sometimes intrusive marketing. Company boss Carsten Spohr even said that he could greet the donors personally with a handshake. He responded to a question how many passengers use the “indulgence trade”. 

Wizz Air boss Jozsef Varadi rumbled a few weeks ago against such donation projects and then caused amusement because he obviously didn't even know that the company he heads also offers “indulgences” and that on the homepage of the homepage.