I believe the fare buckets for award tickets are:
XN = elite (Silver,Gold,Plat,1K,GS) coach award
X = general member coach award
IN = upper elite (Plat,1K,GS) businessfirst award
I = general member,Silver,Gold businessfirst award
ON = upper elite global first award
O = general member,Silver,Gold global first award
Prior to 3/3, the old United NY space was a 1K,GS coach award. There were no other fare classes designating elite award space in the old United.