Around midnight on May 24th 2015 we saw an object fly almost directly over us at a very fast rate. The object looked like 2 slightly swept back, long skinny wings with no center body. There were no lights and no sound. From the time we first saw it untill it flew overhead and behind the houses lasted aprox. 4-5 seconds. About 1 minute later anothe one following the same flight path flew over us. About 2 minutes after that 2 more, flying extreemly close together flew directly over us. These objects continued to appear at random intervals, all were flying from south to north, but not the exact flight paths. Some were to our right, some to our left and some directly over us. Most of them appeared to be the same size, but there was one much smaller one, and one MUCH larger one. We witnessed this over a two and a half hour period of time and saw more than 20 of these wings fly over.None had lights, there was no sound, no contrails. The sky was clear, the weather was calm and chilly.