Prosecutors say it appears that the co-pilot of an ill-fated Germanwings flight was ill. Meanwhile, German airlines have introduced a rule making it mandatory for two crew members to be in the cockpit at all times.
German President Gauck has attended a memorial service for teachers and high school students killed in Tuesday's Germanwings crash. French investigators say the co-pilot deliberately caused the crash.
DW's Berlin columnists - all English-speakers who have lived in the German capital for many years - bring you an insider's perspective on cultural life in one of the world's most vibrant cities.