Frankfurt - Lufthansa long-haul pilots announced Monday they would be joining part of the industrial action planned by their short-and medium-haul colleagues over changes to their retirement plans.
The long-haul pilots would walk out from 6 am (06:00 SA time) Tuesday to 11:59 pm, the Cockpit union said.
Short- and medium-haul pilots on Sunday said they would stop work from 1 pm (13:00 SA time) Monday until 11:59 pm Tuesday.
Long-haul services affected would include all Lufthansa flights on Airbus A380, A340 and A330 planes, as well as any national flights on Boeing 747s, the union said.
The short- and medium-haul flights on the Airbus A320 family, Boeing 737 and Embraer-made planes would be cancelled during the strike.
It is the German airline's eighth strike since April as pilots are protesting a new wage contract with a later retirement age.
Europe's largest airline is battling to reduce costs in the face of stiff competition from budget airlines and emerging Middle East carriers.
The 5,400 pilots employed at Lufthansa, its budget offshoot Germanwings and Lufthansa Cargo want the company to maintain its current retirement benefits system, under which they can retire at 55 and continue to receive part of their wages.
The latest strike occurred Thursday when pilots at Germanwings walked off their jobs for 12 hours.
About 100 flights were cancelled and 13,000 passengers affected.
Since the strikes began in April, about 4,400 flights have been cancelled and more than half a million passengers have had to change their travel plans, Lufthansa said.
Walh said Lufthansa had yet to act on compromises put forward by the union despite the strikes. - Sapa-dpa