The other week my flight was overbooked and so the airline looked for volunteers to take another flight the following morning. I can't stop thinking about this since the number of seats available and sold should've been known to the airline for quite some time.
Someone claimed that airlines expect a number of passengers to rebook or not show up and thus with purpose overbook sometimes. Can this really be true? Or is it a data consistency thing where availability for ticket booking is prioritized? Or was it perhaps due to an unplanned change of aircraft model? I'm certain there might be other answers and that reasons may vary from occasion to occasion and different airlines, but please enlighten me here!