Something for our planefags!
Translated
Aircraft noise
Survey flights at the airport
In the coming nights, residents at Frankfurt Airport will have to prepare for noise due to survey flights.
These flights are planned from Thursday to Sunday (October 29 to November 1), the German Air Traffic Control (DFS) announced in Langen on Monday. On these days from 11 p.m. to about 3 a.m. a test aircraft will circle around the center runway.
https://www.hessenschau.de/wirtschaft/vermessungsfluege-am-frankfurter-flughafen,kurz-fluglaerm-ffm-100.html