https://undergradresearch.gatech.edu/sites/default/files/webform/research_option_proposal_upload/_sid_/essential-united-airlines%C2%AE%EF%B8%8F-usa-contact-numbers-you-should-know.pdf https://undergradresearch.gatech.edu/sites/default/files/webform/research_option_proposal_upload/_sid_/united-airlines-usa-how-to-speak-to-a-real-customer-service-representative.pdf https://undergradresearch.gatech.edu/sites/default/files/webform/research_option_proposal_upload/_sid_/talk-to-a-real-united-airlines-support-agent-in-the-usa-%E2%80%93-quick-steps%20%282%29.pdf