Photos that look like alien craft could be alien craft. Could be. So you start to ponder, to wonder if they could be what they look like. But you know that you still don't know for sure. It's tantalising, I guess. It's fun to speculate. However, they ALL remain unidentified and not identified. If they're all unidentified there is not one single hit for alien craft.
UFO = Unidentified Flying object
IFO = Identified Flying Object