From LH website: Strike actions announced for Monday, 22 April 2013
Ver.di has announced strike actions for Monday, 22 April 2013. Due to the strike actions massive flight cancellations and delays are expected. Germanwings flights will not be affected. Intercontinental flights shall take place if possible.
Lufthansa regrets any inconvenience to Lufthansa passengers caused by the threatened strike measures by ver.di and will do its utmost to minimise impacts on passengers. Passenger support and service has paramount priority.
A list with all cancelled flights will be published Saturday evening, 20 April at this link:
http://www.lufthansa.com/de/en/Travel-information