What is the seating capacity for a 737-400?

The Boeing 737-400's seating capacity varies from airline to airline cheaper airlines usually have less leg room thus making more room for seats which in return offers more income for that airline. With larger more expensive airlines seats will generally have better leg room but will considerably reduce income but increase passengers comfort thus having people return to that airline increasing profits in that way. seating capacity for cheaper airlines can be around 168 and for more expensive airlines around 159.