https://www.devex.com/people/can-i-cancel-my-southwest-flight-without-penalty-devex-2199161
https://www.devex.com/people/can-i-cancel-my-southwest-flight-without-penalty-devex-2199161
https://www.devex.com/people/what-is-cancellation-policy-for-southwest_dexex-2210696