An international treaty under the auspices of the International Civil Aviation Organization (ICAO) requires that all pilots flying internationally be able to communicate in English. One of more famous stories in that regard was a Lufthansa pilot on the ground at a German airport complaining that he had to speak English while in Germany. A British voice came on the air to remind him who had won the war.
Paul Harvey read off a similar story.
A British Airways plane landed in Munich and the pilot was having difficulty finding the gate. The ground controller got increasingly frustrated with the pilot. He then asked if this pilot had ever been to Munich.
The pilot answered “yes, in 1944 but we didn’t land”.
The ground controller suddenly got very polite.
Priceless!