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Are you referring to Archaeopteryx? Hasn't it definitely, especially with recent research, been found to be a bird?
It has a jaw with reptillian teeth, absent beak, a long bony tail, a neck that attaches to skull from rear (like dinosaurs) instead of from below (like birds), a flat breastbone, stomach ribs, reptilian vertebrae, unfused wristbones (birds have fused ones), unfused ankle bones (ditto), sacrum occupies only 6 vertebrae (half the minimum for birds), and (my personal favorite) three bony claws jutting out from the middle of each wing. These are reptillian characteristics, not bird ones.