230 other incident-free Ryanair flights
Around one hundred sectors so far and it hasn't happened yet
Notice a pattern? Extralegroom sums up the FR passenger experience extremely well; it's dreadful, but you know what you are in for when you book.
But, I happen to know, their maintenance is as good and well-organised as the best you will find in the world; in short they do not hesitate to spend good money on ensuring that there are no maintenance delays, diversions, disruptions of any sort. They understand better than any airline I have ever known that spending 10K Euros to avoid disruption costing £500K Euros is a good idea.
That's not to say that they will alllow a cent to be wasted, of course!