The A340-300 has seating for 275 to 300 passengers in the manufacturer's typical design, but the manufacturer also offers a high-density arrangement that seats up to 440 passengers. Seating details of the Airbus A340 depend on the model number and the type of seating the airline chooses.
The A340 is available in four different lengths that also affect the seating arrangements. The A340-200 is the shortest of the family and seats 261 passengers in three different cabins or classes using the standard arrangement. The A340-600 is the largest plane with seating for 379 passengers in the standard configuration. As of 2015, Airbus is working with certification authorities to increase the maximum number of passengers on the A340-600. In order to increase seating space, airlines have the option of moving the bathrooms and galleys to the lower deck. The lower deck can also provide space for the crew lounge.
Airbus A340s are wide-body jets that are 222 inches across, providing for 18-inch seats in the economy class. The width also increases the flexibility in the premium cabins. Air Canada arranges the seating in its A340-300 with six seats across in its first class cabin and eight seats across in most of its economy class. The plane has a total of 30 first class seats and 256 economy class seats.