Interesting thought TR3.
Being a rather bored and sad individual I have done a few back of the envelope calculations to see how much younger a pilot might be at the end of his career compared to somebody with a stationary desk job.
I reckon that a pilot doesn't even save himself a second. Perhaps you would like to check the maths.
Based on a pilot of a 747 with a cruise speed of 600mph = 270m/s who spends perhaps 15 hrs per week in the air and does so for perhaps 30 years, i.e. 84 x 10^6 seconds. Now I'm not a pilot (soon to be rectified fingers crossed) so don't quote me on the above stats.
The pilots time is given by lorentz transormation:
t'= t/root(1-sq(v/c))
where t' is time experienced by pilot and t is that experienced by our office clerk if you will.
t'=84 x 10^6 / root(1-sq(270/3x10^8))
And by my reckoning the difference in time is a mere 0.000034 seconds. So nothing to get too excited about eh?
