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A Cargolux 747-400F is seen in this photo published on the carrier’s website 

C-Checks are major maintenance sessions done every 18-24 months, depending on the type of plane (say Lufthansa and Qantas), and require that “a large majority of the aircraft’s components to be inspected (according to Wikipedia).

This particular C-Check took “around 10,600 working hours” to complete, Cargolux, Europe’s largest all-cargo carrier, said on 25 January.

In addition to its own fleet, Cargolux does maintenance on 747s for other air carriers. That makes it, Cargolux said in its media release, “one of the most important aircraft maintenance centres in Europe.”

Corsair, Silkway and Atlas Air are maintenance customers, Cargolux stated in a fact sheet provided to press. The company said it employs 480 maintenance staff.