I don't personally remember the TWA 707 coach lounge. United's DC-8-10/20/50's all, from delivery, had a five seat coach lounge across from the rear service door and galley delivery but those seats were sold. Coach lounges became the rage with the delivery of the DC-10's to American in November of 1971. TWA ordered L-1011's and they were a year away, so the 707 lounge must have been installed to try to stay competitive with UA
and their DC-10 coach lounges. Then American installed a piano in the coach section lounge of their 747's. About this this same time, UA
equipped many of their DC-8's with 2-3 coach seating. As the article says, the 707's lounges were pulled two years later in 73, but the wide bodies kept their spacious lounges for a bit longer. Crunch time came with the first oil price shock after the 1973 October Yom Kippur War, and then away went the lounges altogether. But I can tell you that flying in coach with 8 across seating on the DC-10 and the spacious lounges was a pleasure. Flying was fun.