that's interesting.
For everyone outside Germany, it was a holliday (HAPPY CADAVER DAY) in STR but a normal working day in BRE (catholic Southwest vs. protestants in North and East of Germany).
DBA actually cancelled most flights that usually don't go on a sunday. LH obviously didnt - or did they cancel any business routes between cities which were both having a free day?
STR-BRE is the Daimler Christler shuttle.. and obviously nobody working in BRE had to go to head office in STR that day.