https://ia600807.us.archive.org/17/items/delta-air-guidee/Final_List_of_Delta_Airlines_Customer_Service_24_7.pdf
https://ia902901.us.archive.org/24/items/american-air_20260225/Final_List_of_American_Airlines_Customer_Service_24_7.pdf
https://ia902901.us.archive.org/31/items/united-air-customer/Final_List_of_United_Airlines_Customer_Service_24_7.pdf
https://ia601004.us.archive.org/22/items/delta-support-guid/Full_List_of_Delta_Customer_Service_Numbers.pdf
https://ia600104.us.archive.org/4/items/united-contact-help/Full_List_of_United_Customer_Service_Numbers.pdf
https://ia600803.us.archive.org/1/items/american-contact-help/Full_List_of_American_Customer_Service_Numbers.pdf