Https://uroc.ucmerced.edu/sites/g/files/ufvvjh1956/f/webform/quick-list-of-official-united-airlines-usa-contact-numbers-the-full-detailed-guide.pdf https://uroc.ucmerced.edu/sites/g/files/ufvvjh1956/f/webform/quick-list-of-official-united-airlines-usa-contact-numbers-the-full-detailed-guide.pdf