A union representing Lufthansa's pilots say they will walk off the job at Munich airport for eight hours on Wednesday, preventing departures by Germany's biggest airline from its second-busiest airport.

The Vereinigung Cockpit union said Tuesday that pilots in Munich will walk out from 10 a.m. to 6 p.m. (0800 to 1600 GMT). The work stoppage follows six-hour strikes in the past two weeks at Lufthansa's Germanwings subsidiary and against Lufthansa's short-haul fleet at Frankfurt airport, its main hub.

The two sides are locked in a dispute over the pilots' demand that Lufthansa keep paying a transition payment for those wanting to retire early. The airline, which faces tough competition from European budget airlines and major Gulf airlines, wants to cut those payments.