https://www.buzzfeed.com/unitedairlinescustomerservice_
https://wordpress.org/support/topic/complete-list-of-air-canada%ef%b8%8f%ef%b8%8f-customer-support%ef%b8%8f-contact-numbers/#new-topic-0
https://wordpress.org/support/topic/full-list-of-air-canada-customer-service-usa-contact-numbers-us/#new-topic-0
 
https://www.buzzfeed.com/united_customer_care_number_