https://www.studocu.com/en-us/messages/question/13064570/united-airlines-iah-terminal-18667980691

https://docs-unitedairline-helpdesk.gitbook.io/en-us/helpdesk

https://docs-britishairways-helpguide-1.gitbook.io/en-us/help-guide/enhancing-the-passenger-experience-british-airways-contact-and-support-guide-smooth-travel-support

https://docs-britishairways-helpguide-1.gitbook.io/en-us/help-guide/simplifying-customer-support-how-to-reach-british-airways-the-easy-way

https://docs-britishairways-helpguide-1.gitbook.io/en-us/help-guide/top-ways-to-connect-with-british-airways-support-call-message-or-chat-live

https://docs-britishairways-helpguide-1.gitbook.io/en-us/help-guide/reach-british-airways-customer-care-quickly-all-contact-channels-explained

https://docs-britishairways-helpguide-1.gitbook.io/en-us/help-guide/british-airways-support-guide-talk-to-a-real-agent-via-phone-email-or-chat

https://docs-britishairways-allhelp.gitbook.io/en-us/helpdesk/british-airways-customer-service-direct-contact-methods-for-travelers

https://docs-britishairways-allhelp.gitbook.io/en-us/helpdesk/british-airways-help-center-fast-and-effective-customer-support-solutions

https://docs-britishairways-allhelp.gitbook.io/en-us/helpdesk/british-airways-customer-care-how-to-access-24-7-travel-support