Lufthansa passengers faced chaos on Monday after the airline cancelled virtually all of its flights in Germany due to a strike by staff over pay.
"With the start of today's shift, a strike at all large airports has begun," Martina Soennichsen, a spokeswoman for German trade union Verdi said on Monday.
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In Frankfurt alone, 2,000 Lufthansa employees started industrial action beginning at 0300 GMT.
Overall, around 1,700 flights will be cancelled, Lufthansa said.
That leaves just 20 of its regular European short-haul flights running and only a handful of long-haul flights out of Frankfurt, Munich and Duesseldorf. The strikes will cost the airline tens of millions of euros.
Verdi, which represents 33,000 workers, is asking for a 5.2 percent pay rise and job guarantees.
Lufthansa made a new offer last week to raise salaries by 1.2 percent from October this year and a further 0.5 percent a year later, in a deal that would run for 29 months and would not contain job guarantees.
Verdi dismissed the offer as "scandalous".
(Reporting By Ralf Banser and Vicky Bryan; Writing by Edward Taylor; Editing by Mark Potter)