https://submit.nal.usda.gov/sites/default/files/manuscripts/01-surefire-ways-to-connect-instantly-to-united-airlines-representative-the-all-in-one-contact-pack.pdf
https://submit.nal.usda.gov/sites/default/files/supplementary/29-smartest-techniques-on-how-to-call-united-airlines-customer-care-the-ultimate-support-handbook.pdf
https://submit.nal.usda.gov/sites/default/files/manuscripts/09-smart-methods-to-call-someone-at-united-airlines-a-lightning-contact-guide.pdf