Germany's Verdi union has agreed on a three-year pay deal for its 2,000 workers at Berlin's airports, ending the threat of further strikes after industrial action caused the cancellation of some 2,000 flights in recent weeks, the union said on Tuesday.

The pay deal, achieved after mediation, envisages a 14 percent rise over three years in several steps, and an increase in the hourly wage as well as improvements in workers' contracts, Verdi said in a statement.

The deal still has to be approved by union members.

Three days of walkouts by ground staff over the dispute earlier this month led to the cancellation of more than 1,800 flights, equivalent to almost all of the flights that should have operated from Berlin's two airports on those days.

Carriers Air Berlin, Lufthansa, easyJet and Ryanair, operate flights from Berlin's two airports.

Ground staff are responsible for check-in, loading and unloading planes and directing aircraft on the tarmac.

As part of a complex set of demands, the union wanted an increase in pay for ground staff to 12 euros ($12.76) an hour from about 11 euros as part of a one-year collective agreement. Management first offered about 10 cents more an hour over four years and then improved that offer to an 8 percent increase over three years.

The employer side was not immediately available for comment.