Wing shaped craft with no noise, blotting out stars as it passed overhead

As my friend and i returned from a job in Vermont, coming back into New York State on Rt. 7 near the border between states, we noticed the stars in our field of view seemed to be blicking out. We pulled into a rest area along the side of the road and got out of our truck.
It was approximately around 2:30 AM and the night was very clear and the area was very dark because of no lights along the road. there was also no other traffic passing by in either direction, and no homes or businesses within 1/2 to 3/4 of a mile from where we were.
As we looked up we saw a dark shape that looked like a giant wing move across the sky, going from east to west. it moved slowly and made no sound at all. the stars were blinking out as it passed over and became visible again as it moved away.
The object appeared to be about 250- 300 hundred feet wide and approximately 80 - 100 feet from front to back.
We could not judge how high in the sky it may have been because we could see nothing but the dark shape blotting out the stars as it moved along from one horizon to the other. it took as many as 10 minutes from the time we stopped the truck, until it disappeared over the trees. there were no lights or any distinguishing features that appeared on the craft.
Source of report indicates that the date of the sighting is approximate.  PD