Ryanair's Irish pilots preparing to strike again in Europe
The strike is the fourth in Ireland for Europe's second-biggest airline and will affect 20 out of 300 flights in and out of the country that day.
The SPF said around 40 pilots at Skavsta airport, 100 kilometers (62 miles) southwest of Stockholm, would go on strike.
Pilot unions in Belgium called on their members to join in the industrial action on August 10.
"Ryanair needs a wake-up call and a strike in the Netherlands might be the only solution," the Dutch Airline Pilots Association said in a statement.
"Since the start of our negotiations in January, Ryanair has been playing for time and even if Ryanair is not taking this ballot seriously, industrial action like in other European countries seems unavoidable in Germany as well," the union said.
Ryanair said it remained open to further talks with pilot representatives to discuss union recognition and collective labor agreements.
"In the interim, we have requested these pilot unions to give us seven days' notice of any planned strike action so that we can minimize the disruption to our customers by canceling flights in advance and offering them alternative flights or refunds," a company statement said.
Ryanair, which flies in 37 countries and carried 130 million passengers last year, averted widespread strikes before Christmas by agreeing to recognize trade unions for the first time in its 32-year history.
But it has since struggled to reach agreement on terms with several of them.
It said the 100,000 affected passengers had all been put on alternative flights or would receive refunds.
They are also seeking that Ryanair staff be employed according to the national legislation of the country they work in, rather than that of Ireland as is currently the case, which blocks the workers' access to state benefits.
Ryanair is Europe's biggest budget airline by passenger numbers, and the second biggest overall behind Germany's Lufthansa.
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