The pilots, flight attendants and ground staff of Alitalia will strike on Monday, May 25, 2015 from 00:00 to 23:59. Also some SEA handling and airport personnel in Milan. (Source: ANPAC).
Announcement of possible Spanish ATC strike on 8, 10, 12 and 14 June 2015 - between 10-12h and 18-20h, with probable delays and cancellations of flights.
According to most press reports, it will only be a protest march in Brussels (the usual walkabout Gare du Nord -> Midi / Noord naar Zuid). However, a general strike warning has also been declared because the unions need to cover the protesters joining their protest walk in Brussels. With that official strike warning (stakingsaanzegging) the unions can offer the protesters the strike compensation (? 35 € nett?), a free railway ticket to Brussels and Jupiler à volonté.
Because the Belgian railways are not on strike that day (the unions need them), I don't think that there will be a lot of strikes that day.
The UFO flight attendants' union said at a press conference on Monday that if an accord was not reached with Lufthansa by June 30, its members would strike the following day with a schedule of more strike days to be announced thereafter that could last to Sept. 16.
Strike threat for 29th June 2015 : the airport inspectors at Brussels Airport
In 2004, the airport inspectors (200 nowadays) were transferred from the federal Police to Brussels Airport Company. They now demand from minister Galant a clear instruction about their rights & tasks.
Direct reason: in mid January (?!), they were not allowed to certain restricted areas by the Federal Police.
In France :
Le SNCTA, syndicat national des contrôleurs du trafic aérien et FO (Force Ouvrière) ont déposé un préavis de grève pour les journées des 2 et 3 juillet 2015, soit, pour les personnels à horaires permanents, de la prise du service de jour le 2 juillet au matin à la fin du service de nuit le 4 juillet au matin.
French ATC possibly on strike : from 2 July to 4 July early morning.