Originally Posted by
BizFlyin
If you purchase the AA flight on its own, then you don't have any protection if there is an issue with the LY flight. Why wouldn't you just purchase the whole itinerary from BA in this case? Solves that problem, and you avoid flying a US airline domestic which in my opinion should always be avoided

There will be protection if purchased as one ticket via ly.com (which, BTW, can be done). It'll be marketed as AA67 instead LY8127.
BTW, I'm not saying that I'm purchasing this itinerary, just wondering why all JFK-SAN are zeroed out...