Apart from the troubles with Ryanair there are many strikes in the air lately.
There have been strikes of the French air controllers recently which has resulted in cancellations, and in Spain all airport ground staff had announced 25 days of general strikes between September and the end of the year. These strikes are on hold at the moment because there are negotiations, but if they don't turn out well for the unions the announced strikes might go on.
Raki Man, I don't know when you will be flying out of Madrid but I suggest you to do a Google search on 'Spanish airport strikes' and you will find press links with the announced dates. Needless to say that you better don't book a flight on one of those dates. Check them out.
Myself I will be flying to Malaga tomorrow (with TUI) and back on the 6th of October and both of these dates would be striking dates, which I didn't know when booking. Normally I should be safe since the unions there have announced that if there isn't an agreement before the end of September they will go on with their announced strikes as from the end of October. We will have to wait and see what happens.
Ryanair I have used many times, and what I personally found most interesting were many of their smaller destinations, such as Perpignan, Volos, .. If you have a hub nearby.
Their main problem at the moment seems to be the fact that they can't keep their pilots. The problem is more than just the holidays of the pilots to be taken before the end of the year, which is the official explanation. There is a general shortage of pilots, and with the bad conditions RA is offering many of them go to other airlines. They only have to choose which one.
I also think more problems are to come with RA.. They can't keep on forcing their staff to work under 'Irish law' when most of their staff is contractually based in one of the many hubs throughout Europe.