https://www.whizlabs.com/forums/q/545774/brussels-airlines-cancellation-policy-explained-what-you-need-to-know
https://www.goodreads.com/quotes/12731620-universally-best-cathy-paciffic-flight-change-cathy-paciffic-flight-change
https://www.whizlabs.com/forums/q/545776/1-855-838-4977-how-to-cancel-a-flight-with-brussels-airlines-step-by-step-proces
https://programminginsider.odoo.com/blog/avianca-customer-service-2/ways-to-talk-to-avianca-airlines-support-live-quick-chat-call-or-email-90
