1921-1939
The emigrant route Libau-Danzig-Copenhagen began as a "feeder route" for the Scandinavian-American Line. From 1921 things went downhill, after the U.S.A. had introduced immigration quotas. In 1924 the ships were rebuilt to obtain more cabin space, at the expense of the emigrant class.
In the 1930s the U.S.A. cut back the immigration quotas drastically, and the number of passengers fell so dramatically that the ships were taken out of service one after the other. In 1935 the DFDS flagship FREDERIK VIII sailed its final voyage from New York to Copenhagen for the Scandinavian-American Line.
In 1937 the most vital of the DFDS initiatives from the between-war years were resumed. The route to the Levant was opened, with its point of departure in Copenhagen.
That same year the Stettin-Copenhagen-Oslo service was divided into two: Copenhagen-Oslo and Copenhagen-Stettin. M.s. KRONPRINS OLAV was entered into service on the Copenhagen-Oslo route.