Beechcraft engineers used magnesium to skin the ruddervators of V-tail Bonanzas dating back to 1947, and magnesium has since become very hard to come by. Engineering an alternative that works as well could earn an engineer, or team of engineers, a share of $200,000 as a reward for saving the fleet from being forever grounded by corrosion.
Source: aopaSociety posts prizes to save Bonanza fleet