24 weeks does seem like an odd margin for purely elective surgery.
But one of the odd things about the alleged late-term abortions is that in (*)(*)(*)(*) near all cases they are not elective in the way that say an early term abortion is.
People picture these very indecisive women who just think at the last minute "Oh my god! I've got to terminate this pregnancy!" But the reality is usually women informed by the doctor that the baby has a very very low chance of survival. Usually to add to this the chances are extremely high that even if the baby survives it will have terrible, terrible problems that keep it from living any kind of life worth living and the mother will also likely suffer physical consequences that might even reduce her quality and length of life.
They're usually performed by an OB/GYN... so what puzzles me is why abortion clinics offer the service for that long... Do hospitals outsource now?

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"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside