Flew in a very similar DC-6, NYC to Amsterdam & return, in 1964. KLM flight - pilot, co-pilot, steward. 12 hrs going E, 14 hrs on the return - headwinds. 4 seats across, 25 rows. Even got to E Berlin that trip - still have the old passport with the E German visa stamp from Checkpoint Charlie. Might even still have some of the E German aluminum coins somewhere. Remember being very relieved to get back into W Berlin. Trip from W Berlin to W Germany I don't recall well - may have been on the back seat of a Vespa.