Pixelation issues on iPhone Air game

Question

I am working on a cross-platform mobile game for Android and iOS devices. I am using Adobe Flash with AIR and AS3 to code the game. I am drawing my character, obstacles, and backgrounds in Adobe Illustrator. The canvas in Flash is set to 960x640. The character was intended to be 1/3 of the screen height so around 213 pixels high. I designed the character in Adobe Illustrator to be somewhere around 900 pixels high. When I imported the character into Flash I animated him, instantiated him using var player:Player = new Player(), and scaled him down to size using the scaleX and scaleY properties. I tested it out on the desktop and Android phone and it looked wonderful. However, when I tested it out on an iPhone, the player was unacceptably pixelated around the edges. I figured the fact that I drew the animation much larger than the intended height must be the problem, so I redrew the player to exactly 213 pixels high and retested on the iPhone without any improvement in the quality of the animation. I also tried converting the MovieClip to a Bitmap vector explained here but that also had no effect on the quality of the animation.

At this point, I am at a loss. Does anyone have any suggestions on how to avoid this pixelation issue that I am experiencing when going from Adobe Illustrator to Flash to the iPhone?