| https://www.cucei.udg.mx/carreras/alimentos/sites/default/files/webform/how-to-get-a-human-at-expedia_.pdf |
| https://www.cucei.udg.mx/carreras/alimentos/sites/default/files/webform/is-expedia-free-cancellation-really-free_.pdf |
| https://www.cucei.udg.mx/carreras/alimentos/sites/default/files/webform/how-do-i-escalate-a-problem-with-expedia_-escalate.pdf |
| https://amtrakoig.gov/sites/default/files/webform/foia_form/_sid_/How-to-avoid-Expedia-cancellation-fee_-avoid-fee.pdf |
| https://amtrakoig.gov/sites/default/files/webform/foia_form/_sid_/How-to-file-a-claim-with-Expedia_-customer-support%20%281%29.pdf |
| http://amtrakoig.gov/sites/default/files/webform/foia_form/_sid_/15-ways-to-Reach-Alaska-Airlines-Customer-Service_-Complete-Guide_0.pdf |
| https://amtrakoig.gov/sites/default/files/webform/foia_form/_sid_/Does-Delta-give-a-discount-for-seniors_-Fares-Discounts_1.pdf |
| https://247customerservice.zohodesk.com/portal/en/kb/articles/how-to-get-a-human-at-expedia-help-support |
| https://247customerservice.zohodesk.com/portal/en/kb/articles/how-to-avoid-expedia-cancellation-fee-avoid-fee |
| https://247customerservice.zohodesk.com/portal/en/kb/articles/does-copa-allow-same-day-change |
| https://247customerservice.zohodesk.com/portal/en/kb/articles/does-delta-give-a-discount-for-seniors-fares-discounts |
| https://247customerservice.zohodesk.com/portal/en/kb/articles/guide-of-travelocity-customer-service-usa-contact-numbers |
