High speed rail connections,linking forinstance the new Newark airport rail station being built on Amtrak's North East corridor with cities within a three hour radius.
Continental Airlines has indicated they're are coordinating with Amtrak a code sharing reltionship to link their flights with Amtrak's Acela regional and Acela commuter trains.This would allow for easy connections from places like Philadelphia,Baltimore and Hartford to Continental's hub at Newark airport via Amtrak's Northeast corridor which is connected to Newark Airport's terminals through the Monorail.
A traveler connecting on Continental via Newark would be better off (time-wise) taking a Amtrak Acela Regional from say Baltimore to EWR than to take a Continental Express ATR from BWI.
Continental can thus reduce their flights to places like Philadelphia,Baltimore and Hartford to one or two 737s to transfer passengers for peak hour European departures instead of four or five ERJs all day.All other travelers could use Amtrak's Acela trains.The link below brings you to Senator Frank Lautenberg's website dedicated to High speed corridor development,it includes current and proposed travel times betwen certain city pairs along the North East corridor.
http://lautenberg.senate.gov/highspeed/corridors/northeast.html
Through the new Newark airport link Continental can once again reach out to citys where it wasn't profitable or not worth the hassle of clogging EWR's runways more with flights to serve such as New Haven and New London Connecticut.Also NJ Transit plans to open up new service in the next ten years to Allentown and scranton PA,thus offering more opportunities for connecting traffic to the airport.NJ Transit in addition to their many in state rail lines also serves several Up State NY communities via their Pascack and Main Bergen Lines.