United is rolling out the 777-300ER to its fleet. These planes will be the first to feature the new Polaris business class seating, with direct aisle access.

Information about the plane from the United website is here


The plane features 60 Polaris class seats, 24 Premium Plus seats, 62 Economy plus seats, and 204 Economy seats. All economy seating is in a 3-4-3 format (except for 2-4-2 in the last two rows of the plane).

Seat width in economy is 17", down from the 18" in the sUA 777-200, and slightly narrower than the 787 width of 17.3". Bassinets are provided in 20EF, 30EF, and 46EF - the center seats on the three bulkhead rows.

Polaris seats have their own power outlets; Economy seats also have power (2 outlets per 3 seats or 2 per 4 seats; all bulkhead seats have their own power). Each seat has a dedicated USB power port as well.




From sbm12:
I flew on the media preview flight this week and wrote up a detailed report on which seats are good and bad on the new United 77W. Here's a summary of my thoughts.

Polaris




Bulkhead seats remain the best choice for foot well reasons. "Straight" seats are second best while angled seats have a tapered foot well for the last 10 inches of the bed length.




Row 16 has no window. Row 18 has one window far to the rear and part of another forward. The angles are such that you can barely see out of either.
Accessible lav at 2L is the largest on board and useful for PJs changing.
Row 1 has no overhead bins in the center.
Galley at 2L/R handles crew meals so will be busier than the forward galley throughout the flight.


The downside of the "straight" seats is the 9" notch to slide in through but overall those will remain my seats of choice. Avoid 6/7/8 for noise reasons IMO.

Best Window Seat (best to worst):

• 9A (good seat, but proximity to galley/light/noise and lav should be considered)
• 9L (good seat, but proximity to galley/light/noise and lav should be considered)
• 1A (good seat, but proximity to galley/light/noise should be considered)
• 1L (good seat, but proximity to galley/light/noise should be considered) Picture from 1L
• any other odd-numbered A/L (slight preference to A over L)
• any other even-numbered A/L (slight preference to A over L)
• 7A/L
• 8A/L
• 6A/L
• 16A/L

Best Center Pair Seat (best to worst):

• 9D/G (slight preference to D over G)
• 1D/G (slight preference to D over G)
• Any other odd
• Any other even
• 18
• 6

Economy Plus


Mini-cabin is probably the best choice. Or row 39/40.
AVOID 24A/L at all costs. Freezing cold in flight and the narrowest seats on board. Plus no window.
Aisle seats are a smidgen narrower and the center 4-block has legroom issues.
Bulkhead seats have good legroom, very similar to what extending your feet on a normal row would offer.


Economy

Row 50 outside pairs are some of the best, though all the way at the back. A little extra space (especially under-seat stowage) and still some overhead space, something 51 lacks. Row 51 also has a misaligned window.
51/52 in the center are lacking overhead bins.
37 on the outsides are lacking overhead bins.
Aisle seats are a smidgen narrower and the center 4-block has legroom issues.

Baby Bassient Positions in Business: 9A & 9L, E+ 19EF, 24EF, E- 40EF