These objects were not known man made aircraft.On January 10 2009, 2110 hrs, I took a break from watching a movie (paused it) and went outside to smoke a cigarette. I enjoy looking up to the night sky especially on clear nights when clouds are at a minimum or none are present (the latter applies to this event) and visibility is excellent. On this night I was smoking my cigarette when I noticed a commercial and most likely civilian aircraft making its aerial maneuvers for approach for a landing at Miami Int’l Airport. This is typical at the area where I live since aircraft traffic is directed through this area for landing approach. I did not think too much of it given the fact that I see aircrafts performing routine maneuvers on a daily basis. On this night, however, I noticed two objects flying through the night sky (no particular shape) in a constant formation on the background (relative to the aircraft making its northward turn) of the commercial aircraft.These objects were being displaced at a relatively high velocity (or speed, since their general direction and displacement seemed constant). At first I thought that I was seeing “things” and removed my eyeglasses and cleared my eyes. I went ahead and put my glasses on and saw the objects again. The commercial aircraft had a northward direction to while the objects had a general northwest heading. Military aircraft came to my mind in trying to identify the objects but no audible noises were emanating form the objects and no beacon/strobe lights were visible. Unless there are stop secret military stealth aircraft out there flying hypersonic with silent engines (especially at the altitudes these objects were flying) that the civilian population does not know about, I think this classifies as a UFO event. Furthermore, as they traveled in their direction (by the way, one object was leading the other by approximately a couple of thousand feet, at approximately a 30° elevation, measured relative to the trailing object) their emitted visible lighting was fading.I am very skeptical about UFO sightings and associated reports on the tabloids. The main reason is probably because I am an engineer and to me almost everything in life has an explanation through engineering and science. This is the first time in my life that I have encountered a physical event that I do not know what to make of it. By the way, I am certain that these objects were not satellites. I am becoming more convinced that we (habitants of planet earth) are not alone in the universe.