This is a series of orb sightings beginning about a month ago. I live between Boeing Field and Seatac airport. Im a lifelong aviation buff and these arent commercial aircraft. The normal traffic pattern around here is very low the planes are only a few hundred feet in this airspace. The time I see them is usually around 3 AM. The first about a month ago was the closest. I was just standing out looking at the stars when one particlarly bright one caught my eye in the eastern sky. I noticed it was moving west towards and over my house. It was very slow and glowed a very bright whitish blue. It flew west over my house. The object flew an erratic straight path. It pulsed in intensity and bounced around like a balloon on a string. The next night around midnight I saw 2 such orbs, much higher travelling south to north. These were weaving back and forth. Again no flashing red light port starboard beacons or sound. These orbs im seeing almost every night I look now. The one tonight was at exactly 2:58 AM. It came from the south again very high. It actually stopped and also did a series of aerobatic turns and then seemed like it was using a cloud to aalmost hide behind and peek around for lack of. These sightings are not known manned aircraft and also im seeing them in the same quadrant of the sky every night. These are in heavily trafficked airsace between 2 airports again however the commercial flights are very low to the ground over here.