We have a trip coming up from west coast to BOM coming up shortly. We booked this on QR using AA miles a few weeks ago. The trip is in economy class as around the time of booking my searches for J class came in empty. We are a family of 5 so this was not too surprising. However I recollect some mention of how certain airlines release J space close to departure. I am wondering if someone could help me understand which airlines do release close in space, how to find that space and what's the best program to book them from.