Https://www.ucmerced.edu/sites/g/files/ufvvjh1421/f/webform/contact-methods-united-airlines-airlines-customer-service-numbers-in-usa-an-all-inclusive-guide.pdf https://www.ucmerced.edu/sites/g/files/ufvvjh1421/f/webform/contact-methods-united-airlines-airlines-customer-service-numbers-in-usa-an-all-inclusive-guide.pdf