https://efwwfd.zohodesk.com/portal/en/kb/articles/cu%C3%A1l-es-la-forma-de-contactar-a-frontier-en-espa%C3%B1ol-23-6-2025-1
https://hopzone.eu/forums/topic/277166-16-easy-ways-to-connect-with-american-airlines-customer-service/
https://hopzone.eu/forums/topic/277164-10-proven-ways-to-reach-expedia%E2%84%A2%EF%B8%8F-customer-service-your-complete/
https://thetolkien.forum/threads/seven-ways-to-call-how-can-i-speak-to-someone-at-air-france-a-explained-guide.32982/
https://efwwfd.zohodesk.com/portal/en/kb/articles/cu%C3%A1l-es-la-forma-de-contactar-a-frontier-en-espa%C3%B1ol-23-6-2025