Three delta, possibly "bat-shaped" objects observed flying due west between 10,000 and 25,000 feet at very high rate of speed.I observed three delta (the largest was possibly "bat-shaped") objects flying due west between 10,000 and 25,000 feet at very high rate of speed. My wife also witnessed the third and largest object. The objects moved at least five times faster than commecial air liners also flying in the area. The objects were not flying in formation, but rather appeared individually. I noticed each object in turn as it flew overhead and I followed it until it was too distance to view (approximately 20 degrees from the west horizon). Each object travelled from directly overhead to out of sight in no more than 25 seconds. The third object, the largest, returned (from east to west) approximately 25 minutes after it was initially observed. There was no trail behind any of the objects and I was unable to detect any sound from the object. A large military aircraft began circling shortly after I observed the first object.