https://uh.edu/honors/machforms/data/form_56980/files/element_41_71be7b3c67ca665391956ae20e1ba4bb-Contact-Methods-iberia-airlines-Airlines-Customer-Service-Number-An-All-Inclusive-Guide.pdf.tmp

https://wartale.com/forums/topic/183846-complete-and-full-list-of-official-iberia-airlines%C2%AE-customer-service%E2%84%A2-contact-numbers-in-usa/

http://wartale.com/forums/topic/183977-full%E2%84%A2-list-of-delta-airlines-customer%C2%A9-service%E2%84%97-247-live-person-support-contact-numbers-a-complete-guide/

https://community.bigbeartechworld.com/t/full-list-of-official-iberia-airlines-customer-service-contact-numbers-in-usa-complete-step-by-step-guide/4428

https://community.bigbeartechworld.com/t/full-list-of-official-flair-airlines-customer-service-contact-numbers-in-usa-complete-step-by-step-guide/4477