https://www.wyomilitary.wyo.gov/wp-content/uploads/formidable/14/e-x-p-e-dia-usa-customer-service-full-step-by-step-guide.pdf

https://education.aaaai.org/sites/default/files/webform/complete-list-of-official-expedia-customer-contact-numbers-in-the-usa-the-ultimate-detailed-guide.pdf

https://www.lakegeorge.com/event/talk-to-a-live-agent-at-delta-air-lines-usa-detailed-effortless-2025-customer-support-guide-268087/

https://www.thefreshloaf.com/node/77309/16-ways-talk-live-united-airlinesr-agent-step-step-help

https://intercom.help/infanthelp/en/articles/12088893-can-we-add-a-child-ticket-after-booking-american-airlines

http://www.trailforums.com/t/full-list-of-official-frontier-airlines-customer-service-contact-numbers-in-usa-the-maximum-official-guide/16779

https://intercom.help/infanthelp/en/articles/12088933-add-infant-on-united-airlines-flight-using-mileageplus-account

full-list-of-official-delta-airlines-customer-service-contact-numbers-in-usa-the-maximum-official-guide-ota/16903

https://intercom.help/infanthelp/en/articles/12088884-can-you-hold-an-infant-without-ticket-on-american-true-or-false

http://www.trailforums.com/t/full-list-of-official-delta-airlines-customer-service-contact-numbers-in-usa-the-maximum-official-guide/16760