I'm looking for an award ticket for my grandmother to fly her out from ORF to SFO for a week, and i'd like to do it in a layflat config (GF or BF since a p.s. routing won't work for connecting flights on *A) both ways sometime between late February and early April.

Is there a trick for doing this -- perhaps a calendar of dates somewhere when domestic layflat is available so I can search from there? I can't seem to look up specific layflat flight classes on UA or ITA.