I'm going to go waaaaayyyyy out on a limb here and probably earn the enmity of everyone from Tom Poberezny on down (Adam - just in time for me to go to AirVenture this year!!):
Sorry - the old-style logo, even with the great effort by Martt to update it, is too 1948, while the new one is too, well, 1995 (and evokes the NASA "worm" logo of the 70's).
We need something as timeless as the original NASA meatball or the Warner Brothers shield (post 1945 - the earlier ones were too narrow and look dated). Other examples (IMHO) of logos that held up extremely well are the Santa Fe railroad's (as opposed to the 1970's mess the BN had, which is why I suspect the merged companies, BNSF, mostly used the ATSF's logo), Boeing's simple font (enhanced very nicely with the MD logo post-merger), USAF's (no, not the current iteration), General Electric's, MGM (although the stylized lion used by the record division and at the opening of 2001 was an interesting, but failed, experiment), Ford, Paramount Pictures,Shell Oil, etc.
In aviation, probably the best ever, hands-down, logo and font that would still hold up today, over 50 years after their introduction on DC-8's and 707's, is Pan Am's. TWA's double globe was a very close second to that.
OK, everyone, start throwing rocks at me...