"Especially pilots are often disadvantages because we have often have to pay taxes in the country we work and also in the country we live."
Eh, I don't think so!! Unless you're talking about double taxation treaties, which means you pay tax where you work, and then use this to offset against what you owe where you live. It's also a fact that in some countries, pilots get favourable tax breaks from the authorities, so much of their salary comes from allowances with no or lesser amounts of tax. I don't know any pilots that pay any more tax than they have to, and I know some who don't pay what they should.
Farfadet, the wages are quoted gross before tax, because your net tax in the UK depends on your family circumstances and tax allowances.