https://www.independent.com/wp-content/uploads/ninja-forms/11/15-ways-how-do-i-talk-to-someone-at-southwest-airlines-ultimate-guide-to-contacting-a-live-agent.pdf

https://www.independent.com/wp-content/uploads/ninja-forms/11/25-ways-how-do-i-talk-to-someone-at-southwest-airlines-ultimate-guide-to-contacting-a-live-agent.pdf

https://www.independent.com/wp-content/uploads/ninja-forms/11/11-ways-to-contact-united-airlines-customer-service-the-updated-guide.pdf

https://www.independent.com/wp-content/uploads/ninja-forms/11/15-ways-how-do-i-talk-to-someone-at-southwest-airlines-ultimate-guide-to-contacting-a-live-agent.pdf

https://airlinesupport24hour.hashnode.dev/united-airlines-international-customer-service-guide-global-help-247