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https://central.xero.com/s/question/0D58V00009Oxs6ASAR/faqshow-long-do-i-have-to-cancel-a-delta-flight-without-penaltyusadeltahttps://central.xero.com/s/question/0D58V00009Oxs6ASAR/faqshow-long-do-i-have-to-cancel-a-delta-flight-without-penaltyusadelta