https://forum.dimensionengineering.com/topic/30463-how-to-get-in-touch-with-united-airlines-customer-service-via-phone-email-or-chat-options-full-detailed-guide/
https://frontierairlines.uvdesk.com/en/blog/the-complete-guide-to-reaching-frontier-airlines-customer-support-phone-chat-email
https://airlinesfly.uvdesk.com/en/blog/fastest-ways-to-get-in-touch-with-lufthansa-airlines-customer-support-team
