The United Airlines Boeing 737-900 carries 179 passengers across United First + Economy Plus + Economy. Power and Wi-Fi are available on this aircraft. Every seat is rated below, so you can see which have the legroom, the window alignment and the quiet — and which sit next to a galley or lavatory.
The seats rated best on this map are 3A, 3F, 9F, 20C, 20D, 21A. Another 36 seats are rated best or good. Look for exit rows 15, 20 and 57 extra-legroom seats for the most room.
Seats rated avoid on this map are 4A, 4B, 5A, 5B, 5E, 7D. Another 19 seats are rated avoid. These are usually the back rows near the galley and lavatories, or middle seats with no window or aisle.