travel
http://forum.dimensionengineering.com/topic/36707-6-ways-to-use-united-airlines-customer-service-through-phone-number-chat-and-email-options-explained-guide/
http://forum.dimensionengineering.com/topic/36711-8-ways-to-reach-united-airlines-customer-service-by-phone-chat-and-email-stepwise-assistance-guide/
http://flywithexpert.uvdesk.com/en/blog/ways-to-contact-delta-airlines-customer-service-via-phone-email-chat-a-complete-guid
http://all-airlines-support.uvdesk.com/en/blog/united-faqs
http://all-airlines-support.uvdesk.com/en/blog/united-faq-guide