NASA says poor weather conditions have forced them to reschedule the flight for the much anticipated space shuttle Enterprise.
It is now tentatively set for Friday.
The Prototype from Nasa's shuttle program is being flown to the city and will find a permanent home at the Intrepid Sea Air and Space Museum.
When it does make the flight from Washington -- it will piggy back on top of an airplane and will fly past city landmarks including the Statue of Liberty.
NY1 will have live coverage of the big event.