Europe's biggest economy has seen some of the most disruptive strikes in decades this year as unions press for higher wages to offset the surging cost of living.
The strike is likely to add to problems in a sector that regularly faces jet fuel shortages, which often ground local flights and where international carriers struggle to repatriate revenue from ticket sales due to a shortage of foreign currency.
Health service bosses say as many as 350,000 scheduled operations and appointments will be cancelled during the walkout.
Bus, tram and metro drivers walk out in major cities, causing severe travel disruption for passengers in Frankfurt, Stuttgart and Munich.
UK set to see the "biggest day of strike action since 2011", with up to 500,000 workers planning to participate, says a trade union.
Around 300 take-offs and landings with just under 35,000 passengers were originally planned for Wednesday.
Rail, Maritime and Transport union announced to resume its strike due to the lack of improvement in working conditions and payment.
The strike by the health staff is among a string of industrial actions in the UK this winter, including agitations by rail and postal workers; airports are also bracing for disruption over Christmas.
Major news desks at the paper may lose 90 percent of their workforce during a 24-hour strike by more than 1,000 union journalists and other employees, the NewsGuild union says.
The Royal College of Nursing is holding the first strike in its 106-year history on December 15 and 20.
With the British government turning down an offer to negotiate, nurses say they have no option but to strike on December 15 and 20 in England, Wales and Northern Ireland.
With fuel prices rising, the drivers are demanding the government make permanent the "safe freight rate" minimum pay scheme, which is set to expire at the end of the year.
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