https://discourse.maas.io/t/full-list-of-united-airlines-how-to-call-united-airlines-support-usa-contact-numbers-full-guide/13575
https://discourse.maas.io/t/t-al-l-united-airlines-support-customer-service-usa-contact-numbers/13374
https://discourse.maas.io/t/b-e-s-t-united-airlines-customer-service-contact-support-official-usa-number/13481