A few days ago, I was commuting on 9E from where I live to DTW. the flight went out 3 hours late, because someone discovered that it was due for line maintenance check when it got to where I live (small town out station). Mismanagement at its finest, and certainly not pilots' fault. That being said, every regional have issues: some just have more than the others at any given moment. The Delta management could take all the flying back to the mainline and have positive control over the quality of their product once again. But they won't.