The trade unions representing pilots and cabin crew at the Lufthansa Group’s holiday subsidiary Discover Airlines on Sunday announced a four-day strike set to begin on Tuesday. The strike, involving pilots and cabin crew, will begin on Tuesday, August 27, and continue until Friday, August 30, union officials said in Frankfurt. All departures from Germany are affected. Employees recently voted overwhelmingly in favour of a strike in separate ballots. The conflict stems from negotiations with the Verdi union, which has secured the first collective agreements for pilots and flight attendants of t…