Originally Posted by
cynicalmoose
I believe JetBlue is a counter-example - they sell both online and interline connections, and say they don't overbook (although even then they sometimes have to deny boarding due to equipment changes, weight limits, and all the other usual exigencies of air transport).
There is a certain amount of cynicism possible on that one, you are 9 times more likely to be bumped on JetBlue than on Delta. The reasons given are as you suggest, but I'm not sure it makes much difference to the passenger concerned.