What's behind Germany's transport strikes that have stranded air, rail and bus travelers?

abcnews.go.com:

Thousands of travelers across Germany have found themselves stranded after ground staff walked off the job at seven of the country’s biggest airports

BERLIN — Thousands of travelers across Germany found themselves stranded on Tuesday when ground staff walked off the job at seven of the country’s biggest airports.

The one-day strike by the Ver.di labor union, which runs until 7:10 a.m. Wednesday, affects several hundred flights at airports in Frankfurt and Munich, Lufthansa’s main hubs, as well as Berlin, Duesseldorf, Hamburg, Cologne-Bonn and Stuttgart.

The strike is the latest in a series of similar actions in the rail, air and local transport sectors this year. Facing inflation and staff shortages, unions are pushing for higher wages and better working conditions.

Such short “warning strikes” are a common tactic in German contract negotiations. But they have frustrated travelers and commuters and made Germany, Europe’s economic powerhouse with a reputation for efficiency, appear dysfunctional.

Here’s what’s happening with the strikes:

The 25,000 members of the Ver.di union, which includes check-in, aircraft handling, maintenance and freight staff, have walked off the job. Ver.di members staged a similar strike at German airports earlier this month, prompting airlines to cancel hundreds of flights.

In early February, about 90,000 employees with the Ver.di union for over 130 local transport operators walked off the job in major cities across Germany.

And in January, the rail workers' union GDL staged a series of multi-day strikes to protest the state of contract negotiations with the German railway operator, Deutsche Bahn.

One strike in late January was planned for six days and was set to be the longest in Deutsche