Gameplay has a lot of arcade components. There are two possible choices for planes on each stage, computer or human controlled, and your goal is to down the enemy, while getting the highest possible score. The player is encouraged to do stunts (marked on on-board instruments) to raise the score.
Configuration was a real nigphpare, Evasive Action needed a lot of EMS memory, and it was hard to set up. The game wasn't as thrilling after completing all these steps... except if you played against a human. I only did so twice, but it was a rewarding experience: we used modern jets for that, their cockpits and game world were the nicer on the game.
Some time later, we'd use Microprose's Dogfight for that, it allowed serial games and ever nicer cockpits. So EA was the first step...
MiGMan thanks Francisco J. Campos.