Well this is about sched. passenger flights, most types continue way after that as freighter or within airforces.
Correcting the above list;
The Trident last flew sched. pax around 1990 and continued as VIP aircraft for the Chinese Air Force till about 1995.
Spantax was a charter carrier, withdrew its last Cv-990 in march 1987
The 707 should be up in the air doing schedules with Saha Air inside Iran, also selected operations in Africa, Jordania, Romania, Argentina might have a scheduled character.
The 1-11 flies domestics in Guatemala with Tikal Jets till april 2003, might have been replaced by their DC-9s since.
Some of the more interesting propellor aircrafts final passanger services;
Bristol Britannia; BCF Aviation in Zaire actually took pax along, wfu july 1991
Vickers Vanguard; Merpati Indonesia april 1987
Vickers Viscount; true scheduled services by Bouraq Indonesia till mid 1996 / farewell enthousiast flights in England november 1997
DC-4; Air North Canada, early 1990s, enthousiast flights available
DC-6 Namibia Commercial AL
, till august 1999, enthousiast flights will be available in the future
DC-7; mid 1970s, Spantax or somewhere in latin America
Herald; Aerovias Guatemala till around 1997
Lockheed Constellation; scheduled services with Quisqueyana (Dominican Republic) till 1978, selected enthousiast flights available since the 1990s
Lockheed Electra; Reeve Aleutian, december 2000
Martin 404; RentAvion of Venezuela, around 1999 (selected enthousiast flights available in the US)
Many other types have only 1 or 2 airlines left operating passengers around the world; like the Curtiss Commando; Nord 262; Fairchild F-27, Convairs etc.