https://ia600406.us.archive.org/18/items/aa-customer-care/Quick_Access_American_Airlines_Customer_Service_Number_Guide.pdf
https://ia600706.us.archive.org/13/items/airlinecustomer-services/Quick_Access_United_Airlines_Customer_Service_Number_Guide.pdf
https://ia601002.us.archive.org/3/items/deltcustomer-care/Quick_Access_Delta_Airlines_Customer_Service_Number_Guide.pdf