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https://forums.clickstudios.com.au/topic/23927-how-to-talk-to-a-copa-airlines-customer-service-through-call-chat-social-media-or-email-options-a-stress-free-guide/
https://forums.clickstudios.com.au/topic/24013-21-ways-to-reach-singapore-airlines-customer-service-via-phone-number-chat-and-email-options-a-complete-guide/
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https://official-lufthansa-helpcenter.checkoutpage.com/9-ways-to-call-lufthansa-customer-service-via-phone-number-email-and-chat-options-step-by-step-guide