AA
As a side note, the flight was nowhere near 100% full in economy, I had two seats to myself and I know many others did. Business seemed fairly full however.
AA's JFK and ORD going back to 757s from late May to about first week of July. Would tend to indicate that bookings are indeed not great. AA don't do themselves any favours with their appalling reliability on both routes.
Virgin JFK also now 6 weekly for June, and selectively cancelling ATL on various dates in June.