Witnessed at approximately 5:00pm Atlantic Standard Time Sept. 27, 2015. Fredericton NB Canada. My wife and I were in out backyard throwing Frisbees for our dogs. It was a bright clear fall day with no clouds. There was a lot of air traffic. 2 commercial aircraft were heading west, with one following the other, in a staggered pattern. Both aircraft were emitting vapor trails. At a point, approximately 60 degrees vertical from the west horizon, we noticed a third cylindrical object at a 4 o���clock position, behind the first aircraft, following a parallel course heading. It did not emit a vapor trail and had a very reflective surface, which was a lot brighter than the 2 aircraft. This object also appeared to be larger than the 2 aircraft. After watching for approximately 10 seconds it faded and disappeared. I thought that the object may have been the International Space Station, which I have witnessed before, so I checked the NASA website to check the orbit schedule. Nothing matched up. I then checked the Iridium Flare satellite schedule and nothing matched up. We are not sure what we witnessed.