https://community.lambdatest.com/t/full-list-of-united-airlines-customer-contact-numbers-in-the-usa/39016
https://pandorafms.com/community/forums/discussion/expedia-usa-hotline-and-customer-service-guide-complete-phone-list-2025/
https://www.mvsu.edu/sites/default/files/webform/booking-com-usa-contact-numbers-the-official-contact-guide.pdf