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https://forums.funcom.com/t/11-ways-to-communicate-delta-airlines-customer-service-thought-email-and-chat/279142
https://www.sitepoint.com/community/t/05-ways-to-connect-delta-airlines-customer-by-phone-service/477865
https://forums.funcom.com/t/how-to-reach-delta-airlines-customer-service-by-phone/279706
https://forums.funcom.com/t/ways-to-talk-to-delta-airlines-customer-service-now-step-to-step/279738