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https://patch.com/new-york/midtown-nyc/calendar/event/20250218/1ff533a1-be5b-41da-9dfd-df6f6448f496/frontier-cancellation-policy-what-is-the-cheapest-day-to-book-flights-on-frontierhttps://patch.com/new-york/midtown-nyc/calendar/event/20250218/1ff533a1-be5b-41da-9dfd-df6f6448f496/frontier-cancellation-policy-what-is-the-cheapest-day-to-book-flights-on-frontier