Percentages are meaningless without being put into context and also if starting off from a low base. Half of nothing is still nothing.
Aer Lingus took 10% off the gross of all pilots under a reorganisaton called Greenfield around 8 years ago now. With inflation that pay cut has never been restored nor will it ever be. The 11% you quote is over a 3 year period and is only just above inflation in a country which taxes over 50% once you earn a little over 30K a year.