yellowish/orange lights over Burbank / N. Hollywood Area. 4th sighting !I have seen these objects a total of four times. It is best described that they appear just west and south of the Burbank Airport. They are at an alititude just a little higher than commercial aircraft. They move in a controlled manner almost "jetting" from one position to the next. I have inquired with Burbank authorities and they have no information or will admit to inquiries from other curious people. I have also noticed abnormal planes being flown around the same time (very late at night). Usually dark in color with very different lights, unlike the commercial aircraft which has multiple blinking lights. These almost seem to be military or something simular.