Now one thing that's guaranteed to raise salaries is the old 'Supply and Demand' situation.
Sadly, tho', the cyclical nature of the airline business means that every ten years or so we experience a downturn. All of a sudden who needs flippin' engineers anymore?
By the time things are on the up again, there is enough of a pool to fill the need - then, just as it looks as though there may be a skills shortage, along comes the next dip......
Just my two cents' worth, what say the rest of you?