https://www.vevioz.com/read-blog/324122_10-ways-to-reach-access-delta-airlines-customer-service-via-phone-email-and-chat.html
https://www.vevioz.com/read-blog/324130_10-ways-to-reach-access-american-airlines-customer-service-via-phone-email-and-c.html
https://www.vevioz.com/read-blog/324140_10-ways-to-reach-access-lufthansa-customer-service-via-phone-email-and-chat-the.html