Here you go from the top of my head.
LGA - Eagle and Chit (For US Air). ACA LGA base is gone to CVG. Rumor of a Comair base there.
JFK - Eagle Saab gone, I think Eagle may have a jet base here too. Can anyone confirm or deny? Trans States (DELTA) long gone, ACA (UAL) gone. As of right now I don't think any regionals have a base at JFK.
EWR - good old Coex, there to stay (and Jersey Chicks put out). Trans states for a short time with US Air but gone now.
Allegheny - big rumor for awhile of a base at LGA (not holding my breath) we did have a great one in ISP but you guessed it, they closed it.
BOTTOM LINE - the only regional that it hiring at this time with a base in NYC is CHITTACO for US Air at LGA.
Don't forget - Fracts
- Netjets TEB (tittyboro) and HPN (whiteyplaines)
- BizJet Solutions TEB
- Cit Shares HPN and EWR
- flight options/trav air - anywhere (?)
Hope it Helps