GMT's Downtown has been well reviewed... and Brimmicombe-Wood, the designer, did some great research.
But it's squadron-level, focused on Vietnam.
Avalon Hill's Flight Leader was lighter than Webster's Air Superiority/Air Strike/Speed of Heat.
Webster's WWII titles, Over the Reich and Achtung Spitfire were nicely ported to Windows (95) in the 90s... still available as abandonware/shareware, and a great revision of a slowish pen and paper system.
WWII rules by Raiden Minis:
http://www.raidenminiatures.co.uk/Rules.htmlJust MHO, 1:1 modern air rules struggle with the problem that there's a lot of complexity to simulate -- especially if you like reading McDonald-Douglas copy about the bells and whistles on their new airplanes.  But a complex game obscures the essence of air combat, which is compressed decision loops and changing energy balances:
From:
http://www.fastcompany.com/magazine/59/ ... page=0%2C1An effective pilot explodes his rival's comfortable view of the universe. With his familiar clues hopelessly scrambled, a rival under pressure will usually try to interpret the mess from his accustomed perspective. While the confused rival struggles -- and before he has a chance to figure out the pattern that will yield the dogfight equivalent of a snowmobile -- the savvy pilot quickly executes yet another set of maneuvers, once more scrambling the parts and further feeding his opponent's confusion. Ultimately, Boyd wrote, the winner "collapses his [adversary's] ability to carry on." You win the competition by destroying your opponent's frame of reference."