Ex PanAmigo here...
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Was flying 727-121s in 1970-71, as F/E, generally on the FRA-THF run.
Then I went on the 707 and was away from the IGS for a few months.
Came back on 727 as F/O in 1972, mostly doing FRA-THF again + charters.
Speed - I remember 340 or 350 KIAS, some guys flew on the "barber pole".
Then got away again on the 707... then layoffs due to the oil crisis OCT 1973...
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Later (1977) I joined a Seatte charter airline AeroAmerica, captain 707/720s.
They took over Modern Air (CV-990s) operation in TXL...
Operated charter flights for the "Berliner Flugerring" - Spain, Greece etc.
Mostly Y149 seats 720-027s... ex Braniff airplanes.
Ugly Braniff colors - orange banana, or chocolate blue...!
US cockpit crew, German cabin staff.
I left TXL to work with AeroAmerica 707s in Pakistan...
AeroAmerica/Fluggerring operation taken over Air Berlin, around 1979-80.
Originally, Air Berlin was a US air carrier, they had 707s...
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Happy contrails