Many airlines like delta airlines and hotel chains like marriott tend to do overbooking. a good strategy for overbooking should balance the expected opportunity cost of idle service capacity and expected of turning away customers who have reservations.
Overbooking is an airline's means of ensuring that they have no empty seats at take off. It's exactly what it sounds like—an airline sells more tickets than they have seats on the plane. They do this to ensure a full plane when it comes to take-off. Empty seats are a financial drain on airlines.
Therefore, the correct answer is as given above
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