That's a 767. I fly United about 75,000 miles a year and I'm not sure the last time I've ever been on a 767. It's been a long time. This is a fairly typical 777 seat map (without Premium Economy). https://www.united.com/ual/en/us/fly/travel/inflight/aircraf...

I also end up flying a lot of 737s which are 6 across in economy.

I was on a 767 from Philadelphia to Zurich about two months ago with American Airlines. But man it was an awful experience. Overnight flight with shared TVs playing an action movie with lots of flashing lights and explosions combined with outdated seats and no individual climate controls meant I landed in Zurich at 8am having gotten no sleep the whole flight.

At least Delta provides masks on their red-eye flights.

My 767 is newly refitted with the Polaris business class - it can't be that much of a weird relic! Your example is the old pre-Polaris business class.

Nice breakdown of the UA fleet here: https://www.planespotters.net/airline/United-Airlines

Looks like 767s are ~28% of their current fleet's widebodies.

It may be just the routes I fly. I'm mostly 737s or 757s, or the odd 777 (usually going to Asia). I do see I have a 787 on my next trip to Europe but that's 9 across in Economy Plus/Economy. (Premium Economy is 7 across.)