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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.
The limit is not actually on ounces of liquid, but on the capacity of bottles you bring on the plane that contain liquid. And the amount you are allowed depends on the country. A typical limit is 3.4 ounces (100 millimeters) but check online with your airline/airport, and do it for every country you are going to visit.