https://www.certcommunity.org/forum/topic/27649-united-airlines-%C2%AE-customer-service%E2%84%A2-usa-contact-numbers-a-complete-guide/ https://www.certcommunity.org/forum/topic/27651-delta-airlines%C2%AE-customer-service%E2%84%A2-usa-contact-numbers-a-complete-guide/ https://www.certcommunity.org/forum/topic/27652-american-airlines%C2%AE-customer-service%E2%84%A2-usa-contact-numbers-a-complete-guide/ https://www.certcommunity.org/forum/topic/27654-%E3%80%90official%E3%80%91list-of-delta-airlines-customer%C2%A9-service%E2%84%97-247-live-person-support-numbers-a-complete-guide/ https://www.certcommunity.org/forum/topic/27655-%E3%80%90official%E3%80%91list-of-american-airlines-customer%C2%A9-service%E2%84%97-247-live-person-support-numbers-a-complete-guide/