Https://conflict.ucmerced.edu//sites/g/files/ufvvjh2091/f/webform/full-list-of-united-airlines-customer-contact-numbers-usa-or-uk-2025-guide.pdf https://conflict.ucmerced.edu//sites/g/files/ufvvjh2091/f/webform/full-list-of-united-airlines-customer-contact-numbers-usa-or-uk-2025-guide.pdf