United Airlines operates several different configurations of the 737-900 aircraft. This version operates with 20 First Class seats and 159 Economy Class seats, 39 of those Economy seats being Economy Plus seats.
Economy Plus is offered on this aircraft type. Economy Plus is not a separate class of service but is standard economy with up to 5 inches of extra legroom. These seats are located nearer to the front of the aircraft and passengers in this section will be served first. Charges for these seats will depend on routing and may be purchased at the of booking or check-in.