Somehow the 727 and 737 threads seem to have been mixed up here !
Tarom Tupolev 154, Ilyushin II-62, BAC 1-11, Boeing 707 to Bucharest and Constanta.
Sometimes all on the same series as loads rose and fell through the summer. Tarom seemed to enquire how many were booked and only send out an aircraft that was appropriate. Well into the 1980s you might even get an IL-18 turboprop for the first/last runs of the year.