I don't think "earning" rides in the better planes was suggested above. I believe the suggestion was each pilot gets X number of sorties in "uber" planes per tour, regardless of that pilot's skill level.
Ok, so the top pilots would possibly make their sorties last longer than the newbies, but that's no different than normal.

I don't see how it would un-balance things at all. The only possible problem would be when we get the ability to re-arm and re-fuel, but even so a fellow can only play for so long in the same sortie... I think it is a reasonable way to limit supply of uber-planes.
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