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http://official-united-airlines-help.myshopify.com/blogs/news/ways-to-connect-with-united-airlines-customer-service-via-call-chat-and-email-a-full-fledged-guide-1
http://official-united-airlines-help.myshopify.com/blogs/news/ways-to-call-united-airlines-customer-service-through-phone-number-chat-and-email-options-a-complete-guide-1
http://official-lufthansa-customer-helpcenter.myshopify.com/blogs/news/ways-to-call-lufthansa-customer-service-by-phone-email-support-or-live-chat-a-complete-step-by-stepguide