BOAC, may be it will help you to understand if I complete the quotation, as I left the last sentence out. "Your Western friends who are asking - they simply don't understand what kind of crap electronics we have had".
Now, when I imagine 10 planes to land, within set short time, none has means on board to know where he is, the only orientation is barometers, say, a compass
and what ground control says - this tricky dance may make sense. May be it is plannned so that none cross ways with each other whatever they do (within reason and procedure).