https://airlinespolicycareservice.zohodesk.com/portal/en/kb/articles/does-norse-allow-cancellations-17-9-2025-1
https://airlinespolicycareservice.zohodesk.com/portal/en/kb/articles/does-norse-allow-cancellations-17-9-2025-2
https://airlinespolicycareservice.zohodesk.com/portal/en/kb/articles/does-norse-allow-cancellations
https://artsciportal.wustl.edu/sites/artsciportal.wustl.edu/files/webform/webform_12777/_sid_/faq-do-delta-prices-go-down-on-tuesdays.pdf
https://artsciportal.wustl.edu/sites/artsciportal.wustl.edu/files/webform/webform_12777/_sid_/24hr-what-is-the-24-hour-rule-for-air-france.pdf