The big advantages are ease and flexibility. Ease: there's no TSA security before boarding, so (from a passenger perspective) you just climb in to the plane an

The big advantages are ease and flexibility. Ease: there's no TSA security before boarding, so (from a passenger perspective) you just climb in to the plane and take off, similar to hopping into a car. Flexibility: you don't have to worry about airline schedules. When your meeting is over you just hop into the plane and fly to the next destination. Especially when traveling to/from non-major airports (where there may only be 1-2 flights/day) or small cities (which may only have a municipal airport) there can be huge time savings from using a private plane. (Source: I've tagged along when university administrators flew to a Reagents meeting. It was a propeller plane and what would have been a 2-hour drive was a 15-20 minute flight. I'm not a pilot so I don't know how much paperwork was involved nor how much lead time the pilots had before we told them we were ready to leave.)