So, I was just doing a dumb booking TLV-SAN on May.
LY of-course offer connections to AA (both via LAX and JFK) and to DL (via JFK, however $1000 more expensive each way).
While doing the search I noticed that while LY makes SAN-JFK marketed by them available for booking (flight AA66//LY8086), they don't offer JFK-SAN under their code (flight AA67//LY8127).
A searched on EF showed LY8127 as zeroed out on all days I tried in May (tried all the first week of that month). Tried in January, and it was OK for that month.

Ofcourse, I can always purchase the flight marketed by AA (which is actually a very good bargin for BA tier points and avios, assuming it credits correctly - I have had some problems with it), but I was wondering how come LY8127 is zeroed out on all days I tried. Any insight? Maybe a bug?