Cornwallis,
Yes they were 5 m each side of centerline
That sort of comment was the one I was refering to "get back in the middle"
JW : I remember there were actually 3 separate corridors
Some interesting info here :
http://en.wikipedia.org/wiki/West_Berlin_Air_Corridor
Northwestern / Hamburg Air Corridor: Hamburg, Bremen, Northern Europe
Southwestern / Frankfurt Air Corridor: Frankfurt (Main), Nürenberg, Stuttgart, Munich, Southern Europe
Western / Bückeburg Air Corridor: Hanover, Cologne/Bonn, Western Europe