Apparently there are rules in this game to play Down in Flames solo. Is that correct and are they interesting?
The game is solo, but can be played with 2 players.
When playing solo, basically, for the Germans, you draw 6 extra cards, shuffle them, and then put the cards down face up from left to right, leaving 6 cards still facedown and not used.
There are some basic rules regarding which cards to use (left to right, attack, mixed, defend) when responding to your cards, and when initiating maneuvering and firing.
There are also some German counters that can modify the default German fighter parameters (both good and bad) that are drawn randomly.
The Allied plane uses a counter that matches the skill level of the Fighter or Bomber group from the game.
I found the fighter-to-fighter combat to be interesting... I tried not to peek too hard at the exposed German cards when playing. The bomber-to-fighter battles are less interesting, as they are in the normal game.
Download the Playbook from the B-17 FFL Rulebook - Version 2 FINAL file entry. It has the updated rules.