FANS - Wasn't that Future Air Navigation System (or at least something similar). Think it allows datalinking between the aircraft and ATC.
LHASO - do a search on Rumours & News, you'll no doubt find a detailed discussion. Think its Land and Hold Short Operations which are in effect at ORD. Some carriers aren't too thrilled with the idea, so will not comply.
You could ask on either the ATC or Ops/Dispatch forae.
rgds