Not just airlines (or rather plane manufacturers) but bus and train manufacturers, too. And car makers when it comes to the back seats. Basically any company producing means of multi-person transportation.
Distance between seats is determined by the airline, not the plane manufacturers. The seats mount on rails and are easily moved around by the airlines to optimize amount of possible seats.
Not just airlines (or rather plane manufacturers) but bus and train manufacturers, too. And car makers when it comes to the back seats. Basically any company producing means of multi-person transportation.
Distance between seats is determined by the airline, not the plane manufacturers. The seats mount on rails and are easily moved around by the airlines to optimize amount of possible seats.