https://official-united-helpgroup.gitbook.io/ways-to-reach-united-airlines-customer-service-via-phone-email-or-chat-a-full-guide
https://official-lufthansa-helpcenters-usa.webflow.io/
https://official-lufthansa-helpcenters.webflow.io/
https://www.overlandbound.com/forums/threads/12-ways-to-reach-lufthansa-customer-service-via-phone-and-email-option-a-step-by-step-explained-guide.50693/
https://forms.americantowns.com/viewarticle/31741501
https://hackmd.io/@official-expedia-groupdesk/13-ways-to-reach-expedia-customer-service-directly-by-phone-number-chat-and-email-a-full-guide
https://www.americantowns.com/news/5-ways-to-call-lufthansa-customer-service-directly-via-phone-chat-and-email-options-a-complete-guide-31741506-ackerly-tx.html
https://www.overlandbound.com/forums/threads/12-ways-to-reach-lufthansa-customer-service-via-phone-and-email-option-a-step-by-step-explained-guide.50884/