For any guys who are not from wither the UK or Ireland and on the Brookfield contract you should be able to avail of tax relief from foreign earnings. It will depend on where you are based etc. etc. There are also overnight allowances and other tax breaks that the Irish tax code allows for.
Its not as straight forward for the UK based guys but my accountant here in the UK is dealing with an adviser in Dublin who is giving him the information so that the FO mate of mine will get sorted. he has taken the attitude that f he spends a grand on professional fees now it will be worth it. His big worry of course is that he wil do all of this and BRK will still make him use one of their three advisers.
There are good tax planning measures around and BRK are preventing the contractors from availing of them. Its as though they are looking to make life as difficult as possible for themselves by ensuring the pilots are as disgruntled as possible.