German airline Lufthansa said Tuesday it will cancel 1,000 short- and medium-term flights to and from Germany Wednesday on the second day of a two-day walkout by its pilots.

"One thousand Lufthansa flights are cancelled, 140,000 passengers will be affected," the carrier said in a statement after the pilots' union, Vereinigung Cockpit (VC), announced that it was extending a strike that began early Tuesday into a second on Wednesday.