Have been tracking some flights for February.
Fares dropped but then it turns out there are two SFO-LIH nonstops on this particular date, one departing in the morning and one in the late afternoon.
The morning one is a 737, no lie flat. The late afternoon one is a 757.
I'd heard that late January to early February is not necessarily shoulder season, so that may be why two flights are scheduled.
But vastly different equipment ...