Speaking about Europe. Wizzair virtually disabled search and reservations over the web with their paranoid "anti-robot" algorithms, and at some point they had this mysterious "service fee" appearing randomly but discriminating web browser. At Ryanair the reservation workflow is basically one massive dark pattern and upselling designed to make you fell bad. Then there is fucking booking.com, this site opens randomly and unpredictably at various moments while clicking through the search and reservation workflows.