It makes sense that the Tuskegee Airmen would be superior to many of their Caucasian-based squadron counterparts, due primarily to their selection process. Since there was only one African American Squadron at the time, it stands to reason that the selection process resulted in only the top tier candidates making the cut for a pilot slot. In other words, you have a single squadron that is the distillation of the best piloting talent in the African American community. Conversely, the best Caucasian piloting talent was distributed among other squadrons.

That this was based on race is statistically arbitrary. It could have been Eye color, hair color, being born during an odd or an even numbered month, it doesn't matter. Race was simply the discrimination De-jour in the 1940's.

That said, I personally doubt claims of a perfect escort record. The nature of fighter escort often comes down to luck; simply being in the right place at the right time-or not. While the aforementioned logic explains why they would be a particularly skilled fighter squadron, it would not explain a miraculous lack of losses. Remember, it's also possible that an aircraft that was thought to be lost to flack later in the mission (and there for wouldn't be counted as a TA loss) was actually lost to enemy fighters.

None of this should diminish the accomplishments of the Tuskegee Airmen though. They are an amazing group: They fought to earn their wings, they fought with their wings, and have left a legacy that can be celebrated by people of all race, sex, and age.