The pilots’ union at German airline Lufthansa says it is calling additional strikes for Tuesday and Wednesday, following a two-day break in its campaign of walkouts.

The Cockpit union said Sunday that its members scheduled to fly short-haul flights would strike on Tuesday. The union plans to add long-haul routes to the walkout on Wednesday.

Cockpit staged four days of strikes last week in a pay dispute that’s festered for over two years. The union says a hastily convened meeting with Lufthansa on Sunday failed to produce a resolution.

Cockpit is seeking retroactive raises of 3.66 percent a year going back 5½ years.

Lufthansa offered Friday to increase pilot pay by 4.4 percent by mid-2018, and make a one-time payment equal to 1.8 monthly salaries in lieu of past raises.