This morning, Lufthansa and its subsidiary Eurowings experienced a group-wide IT system failure, which led to delays and flight cancellations. The IT failure at Lufthansa meant that airports no longer had the necessary data to check in passengers or board the aircraft. The group confirmed the disruptions. "For this reason, delays in check-in and also impacts on flight operations must be expected," Lufthansa said. The cause of the failure was apparently damaged fiber optic cables that were severed by an excavator during construction work in Frankfurt am Main. Passengers affected by the failures were asked to find out about the status of their flight online. The AUA parent company canceled domestic flights in Germany and recommended switching to rail. This is reported by the FAZ. At Austrian Airlines, the effects are currently still minor, flights to Frankfurt are currently temporarily suspended, and some other flights may be delayed. According to Lufthansa, no other subsidiary airlines are affected except Eurowings. Frankfurt Airport particularly affected Frankfurt Airport was the most affected. German air traffic control is no longer directing planes to Frankfurt to prevent the hub from filling up. The planes are being diverted to other airports such as Nuremberg, Cologne and Düsseldorf. International flights are also affected by the landing closure, meaning that many people changing planes are missing their connections. The second major Lufthansa hub, Munich, has not yet been closed by air traffic control. However, if the problems persist for a longer period, this could also be the case, according to the ORF. On Friday, Frankfurt Airport will be closed.