Aerial ww2 solo combat hex and counters boardgame

Well, this topic has been touched on in other games. Wings Over France is a fine solo WW1 air battle game and can be used for inspiration. You can read about it here at http://www.sportsgameshop.com/war.html.

B-17, from the now defunct Avalon Hill tells the story of WW2 combat from that of a single bomber crew attempting to complete 25 missions.

Statistically, I've read that something like 80% of all aerial victories in WW2 came about from sneaking up on the enemy plane undetected - so it may not be unrealistic to simply have the enemy aircraft fly straight and level most of the time.