Al, I have about 600 birds on my list. I have birded in all 50 states and I have never observed the Condor.
I traveled all day to Aransas National Wildlife Refuge in Texas just to see the whooping crane. After searching for about six hours, I finally saw three about a mile away. I was fortunate that a fellow birder had a spotting scope.
Since then I have seen only one and that was a a migratory single at Hiwassee Wildlife Refuge close to Decatur, TN. I have also observed better than 20,000 Sandhill cranes there, bald eagle, golden eagle and may other species.
You are very fortunate to see one on the fly.
Paul E. Smith