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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.
Although the short answer of how many carry-on items you can take on your flight is two, you'll have trouble if you attempt to travel with two small suitcases. Each airline has its own rules concerning carry-on items but, in general, you're permitted to board the plane with a traditional carry-on bag and a personal item.