The cabin layout for the Airbus A340 aircraft is designed so that no passenger is ever more than one seat away from an aisle, except in the high-efficiency format. The specific seating layout varies by seating class from first class down to high-efficiency seating.
First class seating offers four seats per row, one at each window and two in the center aisle with a table between them. In business class, there are six seats per row, two at each window and two in the center. Premium economy features seven seats across, with two at the windows and three in the middle. Standard economy offers eight seats per row, two at the windows and four in the center. High-efficiency seating includes nine seats per row with three seats each at the windows and center aisle.