Columbia, being the first shuttle built, weighed more than her sister ships. After building Columbia, NASA determined that an orbiter’s aft structure did not have to be as beefy. Consequently, Columbia didn’t get some of the more sexy assignments due to her lower performance capability compared to the other orbiters. Still, she flew all her missions exceptionally well. She was a proud old bird. I know she did her best to bring her last crew home safely, just as she had done twenty-seven times before. However, her mortal wound was just too great.
