gladrag:-
With friends like that who needs enemies said the West Berliners...etc..
The West Berlin authorities were in no doubt about the perilous fate of their population should cold war look as if it were likely to become hot. Little that could be done other than to evacuate as many as could be moved in whatever time was left, if the political outlook was going pear-shaped.
To that end the then new airport terminal at Tegel was designed for the rapid check-in and boarding of pax from a central circular access road, through a dedicated check-in, boarding gate, and jet-way to the aircraft. An identical terminal alongside would have doubled that capacity, but in the event was never built. No doubt road and rail links through East Germany would suddenly have been unavailable, and certainly the safety of Allied aircraft in the three corridors was never guaranteed by the Soviet Government, witness words to that effect stamped in Cyrillic script on each and every Air Safety Centre notification to them of an Allied air movement.
Entirely possible of course that the first hint of things going hot would have been the Red Army tanks pouring through Check Point Charley, in which case ignore all of the above...