Https://undergrad.psu.edu/files/webform/united_airlines_customer_servicetm_usa_contact_numbers__in_full_detail_guide.pdf https://undergrad.psu.edu/files/webform/united_airlines_customer_servicetm_usa_contact_numbers__in_full_detail_guide.pdf https://undergrad.psu.edu/files/webform/united_airlines_customer_servicetm_usa_contact_numbers__in_full_detail_guide.pdf