https://intercom.help/travelassistant/en/articles/10788954-faq-answers-how-soon-do-you-have-to-cancel-a-cruise
https://intercom.help/airlines-support-aefaa9296861/en/articles/10788943-step-by-step-what-is-the-cancellation-policy-for-united-airlines
https://patch.com/california/unioncity/calendar/event/20250317/0da6110c-5dc2-40d6-9573-83dec4c7247a/–what-is-the-cheapest-day-to-fly-on–