An all-day strike by pilots at German airline Eurowings caused numerous flight cancellations at the Lufthansa subsidiary on Thursday. Tens of thousands of passengers had to switch to other flights or the train or postpone their journey. According to Eurowings, about half of all flights were cancelled. On average, the airline operates around 500 flights a day to destinations in Germany and Europe. In Dusseldorf alone – Eurowings’ biggest flight hub – 118 flights were cancelled, according to information from the airport. The fact that Eurowings was still able to offer almost half of the planned …