Maybe the previous comment should be re-phrased to say "if only Pre were as prevalent on the final domestic segment..."

Some do get it, but it's much less common. Even as we didn't get it on Monday, we saw several others who "usually" get it also fail. In talking with a TSA Pre-Checker at JFK a few months ago, she said she'd seen it only once where someone registered actually got it on the domestic leg of an international. Not common at all.

The one time we did get it, the domestic leg was the next day, and we did a re-check-in the night before. Even the AA TA was surprised that we had it when she checked.

Cheers.