https://www.devex.com/people/ua-faq-united-airlines-cancellation-policy-2109902

https://www.devex.com/people/ua-faq-united-airlines-cancellation-policy-2109902

https://www.devex.com/people/ua-faq-united-airlines-cancellation-policy-2109902

https://www.devex.com/people/ua-faq-united-airlines-cancellation-policy-2109902

https://www.devex.com/people/ua-faq-united-airlines-cancellation-policy-2109902