Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,170
When Premium Economy award space is available, it is shown. There are only ever 2 seats per flight available, and when they go they are gone...
IIRC, you will only see Business (not available) when there are alternative options being shown that do indeed have Business award space.