Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP)
Confusion
No Specific Anomaly Occurred All Types
Flight Crew Became Reoriented
Airport; Human Factors
On the ground I briefed for the arrival at GYY planning to land Runway 12. Displaced threshold and landing distance was discussed. Runway 12 was anticipated due to light winds favoring that runway. I had not landed on 12 for several months. On base; for a brief moment I thought I picked out the end of Runway 12; but immediately realized I had spotted the newly constructed end of the future extension of Runway 12. The extension stands out distinctly from the surroundings because it is new white concrete. The new extension is not connected to the original runway and is still blocked off by an active high railroad embankment between the new extension and the useable current runway. We noted the distinct nature of the new construction and how the normal runway blended into the background as usual. My concern is that under high workload or reduced visibility operations a pilot may mistake the new construction for the end of the useable runway with disastrous consequences. The airport authority should issue a Notam about the new construction and the new construction should be marked with an X such as used to indicate closed runways.
Captain reports the Runway 12 extension at GYY; which is under construction and not connected to the old runway; can be mistaken for the active runway. The new and old segments are still separated by a high railroad berm.