Don't take this as definite, but I've heard that in Europe at least, pilots @ BA & AF are earning a cut above the rest.
Don't forget Corporate jet flying can also bring attractive packages (not just tax-free cash!)
I think Lifestyle is a major consideration before salary though-lots of money can bring major boredom if you're not careful!
Choose an airline with good staff morale, nice a/c, an interesting route network, a multi-cultural work environment & a decent salary.
In other words, Emirates!
Oh Lord, please won't you buy me, an Emirates B777 job