Business travel can be unpredictable: Flights can be delayed, meetings rescheduled or assignments changed — sometimes with little notice.

But now, those last-minute changes could prove costly as more hotels impose 48-hour minimums for canceling a stay without penalty.

Marriott International, which recently acquired Starwood Hotels and Resorts, was the first with the new policy. Last month, it put into effect a 48-hour cancellation policy for new bookings within the Marriott and Starwood brand families in the United States, Canada, the Caribbean and Latin America. Hilton Worldwide is imposing a similar cancellation policy in the United States and Canada for new bookings as of the end of this month.

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