AA and UA
introduced their DC-10's in late 1971 and both carriers equipped their aircraft with both First Class on Coach Lounges that were quite large. The American 747 had a piano bar in coach, the DC-10 did not.
The L-1011 was introduced about a year later and included a coach lounge on TWA. PSA, which was a California INTRASTATE carrier, replaced the belly galley with a lounge. Only their L-1011's were equipped this way. No UA
DC-10 ever had a stairway to any lounge.
The upper level (cockpit level) on the first 747's was a first class lounge.
As far UA
DC-8's, the DC-8 10/20/50's were equipped with both a first class and coach lounge. The coach lounge consisted of five seats facing each other with a table in between, across from the rear galley. These seats were assigned, and not held open for passengers to wander back to.
Most US airline's 707, DC-8, CV
-880 had first class lounges. UA
was the only airline that kept the DC-8 lounge through its entire length of service. The DC-61/71 and 62's did not have a rear lounge. I don't know if the DC-8-33's acquired in 1968 had the lounge installed or not. They were grounded by 1974. And when they were in service, they looked just like the Series 20 Eights that United had operated since 1959.
Of course, many of the four engine piston and turboprop aircraft had rear lounges. DC-6, DC-6B, DC-7's (all series) had the circular lounge in the tail, although United's DC-6 Coach (DC-6T as they called them) did not have the lounge. Some Electra's had the lounge also. The last Electra I flew on, a PSA flight on a former American airplane leased from McCullough Oil of Lake Havasu was configured 3-2 all coach, but still had the first class lounge seats in the tail.
The above is all from memory, experience, although I do have a 1979 UA
Planner that has seating charts for the DC-8's.
The airlines pulled the lounges out of the wide bodies in 1975 or 1976, after the first Oil price shock. This was done before the DC-10's and L-1011's were changed from 8 to 9 across seating.
United DC-8's went through quite a few different seating plans. While they were introduced with first and coach, with first taking up almost half the airplane, the coach section, of course, grew and first class shrunk. In 1964, United equipped some DC-8 with 2-3 One Class seating, first introduced on the 720-022 and later on the first 727-022's. This experiment was a failure as UA
lost its first class coast to coast to traffic to TW
. Then those aircraft were converted to F/L/Y with L being Standard Class with the One Class 2-3 seating in the center section between coach and first. They called this Red-White-Blue Service. By mid 1966, L Class was gone as was S one class. In the early 70's, some of the DC-8's coach sections were converted to 2-3 seating, probably using the seats in storage from the One Class experiment. Now there was a comfortable airplane. 36-38 inches of pitch and only 5 across in a DC-8. What a ride. After the 1973 Yom Kippur War and the resulting end of cheap oil, the 2-3 seating went away for good.
Flying was a real pleasure 30 and 40 years ago. People actually put on Sunday best clothes to travel. Oh how we sometimes long for the good old days.