While watching airport traffic (commercial, jauan santamaria airport, costa rica), at 370 degrees northwest of ciudad colon, i and another witnessed a very large oblong object appear from very high altitude and descend almost vertically until it disappeared behind the northern rim of the central valley. this sighting was remarkable, because it left no trail, suggesting a meteorite, the speed was much slower than a meteorite and the object remained a brilliant white light throughout it's descent. being a pilot, i don't believe this was a conventional aircraft, and although i cannot judge the distance, it did disappear behind the far rim of the valley which is easily 20 miles from the point of observation. considering the distance of the mountain range, and the size of the object, and the fact that i can't tell how far beyond the mountain range it was, this object must have been huge. i followed it's descent and saw no flash indicating an impact, or anything else that compares this to a meteor event….The object left no trail, no color other than the object being brilliant white. moved slower than a meter descending nearly vertically,relative to the observer, and judging by the distance i can confirm, it must have been huge. today, i have watched the costa rican media today and have seen no other mention or reports, thus far.