Cologne (dpa) - At the airports in the morning of the announced warning strike of the cabin union UFO started. At the airports in Dusseldorf, Cologne-Bonn and Munich so far the first connections have been deleted, said spokesman for the airports. The cabin union Ufo has extended the warning strike of the flight attendants of the Lufthansa subsidiaries Eurowings, Germanwings, Lufthansa Cityline and Sunexpress at several German airports from originally 5:00 to 11:00 am until midnight.