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A Pan Am 727 flight waiting for start clearance in Munich overheard the
following:

Lufthansa (in German): "Ground, what is our start clearance time?"

Ground (in English): "If you want an answer you must speak in English."

Lufthansa (in English): "I am a German, flying a German airplane, in
Germany. Why must I speak English?"

Unknown voice from another plane (in a beautiful British accent):
"Because you



The only one I haven't heard. What's the punchline???