I came across this video either last year or the year before. It essentially an apartment on an Etihad Airliner. Emirates has a similar class as well;
DC-8 = 6 abreast, 3 on each side of the single aisle.I've done Dee Cee Eight, and as I recall, they did have an aisle through the middle.
Ergonomically, three four three is pretty efficient.
Train seating, two three seat couches facing each other, allows a lot of legroom, and occasionally, foot rest.
Similarly, USN C-9 from EAFB to NS Seattle, stopover at Kodiak. ISTR about 110 persons aboard."Cattle class"... I suppose you could describe the seating in a DC-8 charter flight* from MCAS El Toro (Orange County, Ca) to Yakota AFB (Japan) [and the return flight 6 months later] like that... we did have a fueling stop in Anchorage Alaska, but we didn't leave the plane.
The whole aircraft was 6 abreast plain seats - ~250 of them.
* Arrow Airlines.
One big limitation for airliners is the necessity to be able to evacuate the cabin promptly in an emergency.Two by two is probably ideal in terms of accessing the aisle, and as I understand it, regional jets are getting a range increase to facilitate intercontinental point to point.
Off hand, I don't recall all the regulations and standards involved, but when I looked it up to figure it out for Travelling, I think maximum capacity was one hundred forty nine with a cabin crew of three (or four). Maybe three toilets.
The flight from Yakota to & from MCAS Iwakuni, Japan was via C-9B (2 flights to take all of us).Similarly, USN C-9 from EAFB to NS Seattle, stopover at Kodiak. ISTR about 110 persons aboard.
IIRC, it was 2-aisle-3. There was almost no leg room, as the Navy packed the seats in... no first class, either, all "coach"...