Slow moving aircraft that would change lights from white to red, and made a quiet droning sound.I was driving home from work at about 2:30 in the morning. Out of my window I saw a high flying object that was a blinking red light. Out of my window the object appeared to be moving in an eratic pattern, no set course. I thought that this was probably an illusion because of the motion of my vehicle. I continued to watch the object however. On getting closer to my house, I saw another one of these objects. This one was closer. I could make out 3 blinking lights, that seemed to blink in a pattern. This object did not appear to fly eratically, but the blinking of the lights appeared almost in a revolving motion. In addition, flying lower than this object, looked to be a slow moving passenger plane. It had the front white headlights of an airplane. All of a sudden, the white headlights turned off and the object was blinking red lights.I finally got to my house and it was 3 o'clock in the morning. I was extremely hopeful I could get a good look at one of these objects on the ground. Then off in the distance I saw a slow moving object with two white headlights coming toward me.Again, it appeared to be a plane, moving at a set flight path. The object dropped altitude and continued to come closer. Once it got closer, the object appeared to turn, but it did not turn at an angle like a plane. It appeared to make a horizontal right turn. At the instant it made the turn, the white lights shut off and red blinking lights came on. I made out 4 red blinking lights. The object flew low and parallel to my house. As it flew by it made sort of a quiet droning noise. Hard to describe the noise because I've never heard a plane make that monotonous sound before. I could not make out the outline or shape of the aircraft. I would estimate its size to be about that of a small jetliner (737), but again, that is hard to determine, based on the fact that the red lights were all blinking from the rear. The object never displayed both white and red lights congruently.This aircraft was very mysterious and interesting to watch. This is just speculation, but this aircraft seemed almost as if it was trying to simulate an airplane. That night, I saw 3 of these objects. The longest duration was at my house for approximately 3 minutes.