Frankfurt to Cancun. Misleading upgrading process from economy to premium economy through their website, resulting in a couple separated in a 11 hours flight. It gives the option to upgrade in step number one. It shows a premium economy box next to both names in the second step making you believe that you can pay for both and get upgraded. It charges only one upgraded seat in the payment step, because only one was available, although at the second step it sets the premium box sign next to both names. Thus a couple is separated in two different sections of the aircraft just because the algorithm tries to sell anything available by tricking the customers. Indifferent flight attendants that ignore an issue that occurs by the airline.
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