What is the seating capacity of B737-900?

• A. 159
• B. 166
• C. 180
• D. 179

Answer: (D)

Seating capacity is set by how the airline configures the cabin, not just by the aircraft model. The B737-900 is a stretched variant, but the exact number of passenger seats depends on the layout chosen by the airline, including how many rows and seats per row and how space is allocated for crew areas, galleys, and lavatories. In United’s standard B737-900ER configuration, the total comes to 179 seats. That count reflects United’s typical interior arrangement and the space taken by non-seat areas, so it represents the actual passenger capacity used in service. The other numbers correspond to different or lower-density layouts and don’t match United’s common configuration for this aircraft.