The airline said that the changes to its summer freighter flight schedule was 'unavoidable in context with the ongoing global pandemic', reports London's Air Cargo News.
'Strict entry regulations continue to apply in a large number of countries due to the coronavirus pandemic,' a spokeswoman said. 'The continuation of the current flight schedule in its entirety is therefore not possible for operational reasons.'
According to publication Aero.de, an agreement allowing cargo pilots to fly longer hours in response to Covid expired a few days ago.
With the two parties unable to reach a new agreement for Covid flying - in the context of ongoing negotiations over pilot job reductions as part of a wider re-organisation - the carrier has had to reduce its schedule.
The spokeswoman added that 'constructive talks currently continue'.