Delta did not get flights to Berlin through the Pan Am Atlantic Division purchase. Pan Am sold the IGS (Internal German Service) to Lufthansa, LH taking over Oct1990. After the Berlin Wall came down nothing more could stop LH from derving Berlin. Previously only Air France, British Airways, and Pan Am could serve Berlin from other German cities. TWA also began service to Berlin and other German cities with 727's, after the Wall came down, basing the operation at Frankfurt as well.
Delta took over PA's Atlantic Division November 1991. Delta's flights at the FRA operation included Athens, Bombay, Budapest, Delhi, Istanbul, Moscow, Prague, Vienna, and Warsaw, according to the Nov91 timetable.