When it comes to strikes, there has been a long-running battle between the commission and the European Transport Workers’ Federation (ETF) and the ATCEUC, which represent ATC workers at the EU level. The ETF and ATCEUC rebuff any measures significantly encroaching on the right to strike—article 153(5) of the Treaty on the Functioning of the European Union clearly states that the right to strike is excluded from EU competencies.

Ryanair—on the side of Europe’s citizens? (socialeurope.eu)