U.S, March 9 -- ITB is concluded, and for many, Lufthansa strikes forced participants to depart a day early.

Now ITB is finished, but new strikes have already been called for midweek.

Flight attendants for Lufthansa will not serve cocktails on Tuesday and Wednesday but attend picket lines again.

The UFO (Independent Flight Attendant Union) instructed its 19,000 flight attendants members to go on strike on Tuesday from 4 am to Wednesday, March 13 11 pm. It will cripple air traffic in Germany and show that flying on Lufthansa remains a gamble many passengers may not want to take in the future.

It's expected that all Lufthansa departures from Frankfurt will be canceled on Tuesday, March 12. On Wednesday, March 13, the same will happen to...