Economy Class travelers are typically only permitted to bring one piece of carry-on luggage per Japan airlines carry-on size rules, however Business and First Class travelers may be granted additional allowances. The type and route of the aircraft determines the precise dimensions and weight restrictions for carry-on baggage. To ensure compliance, passengers are recommended to verify the latest information on carry-on size restrictions by visiting Japan Airlines' official website or contacting customer care. Following these instructions is critical for a seamless boarding experience and allows travelers to bring comfortable essentials on board within the airline's allotted baggage restrictions.