https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5305360

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5305390

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5305368

https://www.styleforum.net/threads/fifty-4-contact-methods-how-to-reach-a-live-agent-at-delta-airlines%E2%80%94a-step-by-step-guide.806715/

https://intercom.help/infanthelp/en/articles/11598792-adding-a-baby-to-your-american-airlines-reservation

https://www.styleforum.net/threads/12-w-a-y-s-to-call-how-can-i-speak-to-live-agent-at-expedia-a-step-by-step-guide.806733/

https://www.windows11forums.com/threads/nine-ways-to-contact-how-do-i-talk-to-live-agent-at-expedia-a-step-by-step-guide.10603/

https://www.styleforum.net/threads/seven-effective-ways-to-talk-to-someone-at-delta-airlines-a-detailed-guide.806705/

https://www.styleforum.net/threads/need-live-support-at-united-airlines-heres-how-to-call-fast.806737/

https://www.windows11forums.com/threads/10-ways-to-contact-how-can-i-talk-to-someone-at-expedi-a-step-by-step-guide.10612/