https://undergradresearch.gatech.edu/sites/default/files/webform/research_option_proposal_upload/_sid_/united-airlines-helpline-complete-guide-to-customer-support-and-travel-assistance.pdf
https://undergradresearch.gatech.edu/sites/default/files/webform/research_option_proposal_upload/_sid_/united-airlines-helpline-complete-guide-to-customer-support-and-travel-assistance.pdf Website URL: https://undergradresearch.gatech.edu/sites/default/files/webform/research_option_proposal_upload/_sid_/united-airlines-helpline-complete-guide-to-customer-support-and-travel-assistance.pdf Country List: