cavelltodd wrote:
Say you're an American pilot flying to Germany. What language is used
when communicating with the tower? Does the American pilot have to be

ATC and the tower of bigger aerodromes speak English. Note that I said
English and not some Texas backcountry mumble. And you're supposed to
know and use the ICAO phraseology.

At smaller uncontrolled airfields they may or may not understand English.