https://www.diabetesdaily.com/forum/threads/full-list-of-united-airlines-%E2%84%A2customer-support-usa-contact-numbers-faq-guide-answered.151428/

https://www.diabetesdaily.com/forum/threads/full-list-of-official-lufthansa-%E2%84%A2-representative-phone-numbers-in-the-usa-%E2%80%93-complete-2025-u-s-a.151418/

https://davesgarden.com/community/forums/t/1573346/

https://www.diabetesdaily.com/forum/threads/complete-%E2%84%A2-list-of-spirit-airlines%E2%93%83-customer%C2%A9-service%E2%84%97-24-7-talk-to-person-support-numbers-an-official-guide.151415/

https://ameblo.jp/airguidehelp/entry-12929426321.html

https://davesgarden.com/community/forums/t/1573342/

https://ameblo.jp/airguidehelp/entry-12929425988.html

https://www.diabetesdaily.com/forum/threads/full-list-of-official-expedia-%E2%84%A2%EF%B8%8F-customer%C2%AE-service-contact-numbers-%E2%80%93-the-ultimate-official-guide.151385/

https://www.diabetesdaily.com/forum/threads/full-official%E2%84%A2-lists-of-expedia%C2%AE%E2%84%A2-customer%C2%AE-contact-numbers-in-usa-24-7-live-person-support-a-complete-guide.151384/

https://dodcas.org/wp-content/uploads/formidable/10/atencion-de-asistencia-rapida-%C2%BFcomo-puedo-hacer-preguntas-en-expedia.pdf