JetBlue already has a redeye to JFK and Delta will start a new redeye on June 8th. Both Alaka and United have flights to Newark International as well.
One major convenience the new Alaska flight offers is that it's not a red eye. The flight leaves at 7:05am from SJC and arrives at JFK's Terminal 7 at 3:43pm. The return flight leaves JFK at 4:45pm and arrives back home at SJC at 8:23pm. The route will be served by an Airbus A320 (twin-jet, single-aisle).
San Jose went from having one direct flights to New York to five nonstops within a few years. It feels like there is still a lot more to come.
Source: SVBJ