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How many people can an airplane carry? Depends on the aircraft. Some planes such as the 787 and 320 can carry up too 250 passengers, While an Embraer 145 can only hold about 25-45.
Each different type of aircraft has a capacity for different amounts of seats. Some airlines reduce the amount of seats on the aircraft so as to provide more space for higher paying passengers. For example: Jetstar has 335 seats in their Boeing 787-8 Dreamliner. United has 219 seats in their Boeing 787-8 Dreamliner.