When I listen to the audio of Neil Armstrong’s words during the first moon landing, I have heard the “a” ever since I found out that it was what he meant to say. Whether that was wishful thinking, or if I was hearing what the software detected recently (follow the links if you don’t know what I am referring to).
Print version of the news story
NPR’s All Things Considered audio version (includes several playings of the recording).
One additional note: I think that every newspaper that ran the original quote back in 1969 ought to run a correction tomorrow, just for kicks. 🙂