https://www.goodreads.com/quotes/13092959-what-is-the-24-hour-rule-for-klm-a-step-by-step-guide-klm-s
https://writers.coverfly.com/projects/view/89b5a679-001c-490d-85be-9885290355d9/2025UPdate__Cmo_escalar_una_queja_sobre_Lufthansa
https://www.goodreads.com/quotes/13093061-submit-complaint-what-is-the-24-hour-rule-for-klm-klm-s-24-hour-rule goodreads.com
https://regions-and-cities.europa.eu/sites/default/files/webform/multimedia_center/_sid_/%C2%BFC%C3%B3mo%20puedo%20llamar%20a%20Frontier%20en%20espa%C3%B1ol.pdf regions-and-cities.europa.eu
https://regions-and-cities.europa.eu/sites/default/files/webform/multimedia_center/_sid_/%C2%BFC%C3%B3mo%20puedo%20llamar%20a%20Frontier%20en%20espa%C3%B1ol.pdf regions-and-cities.europa.eu