Hmm. Positive discrimination is encouraged in the UK to address historical or cultural imbalance. The issue with women as pilots is far more to do with the cost of training and the bank of mummy and daddy not being opened so readily for Prudence. Pay and opportunities on applying and throughout their career in aviation, in the UK at least, are the same. Indeed, opportunities maybe in favour of women. Gender pay gaps are measured against jobs of similar importance/difficulty and not across a corporate structure. BA or Easy are not required to measure a gender pay gap between pilots and cabin crew but independently. So there is no gender pay gap so these companies do not need to worry.
What is likely to be of more interest after we get over the current bubble of misogynist hunting is the number of black pilots against the population average.