Here's a very good copy of the Randy Hughes recording:

http://www.youtube.com/watch?v=oR5_1e1sSeU

The video includes the following:

Randy Hughes was a singer before he managed Patsy Cline. He was also a non-instrument trained pilot, and piloted the plane that crashed in 1963 killing himself, Patsy, Hawkshaw Hawkins, & Cowboy Copas (who was also Randy's father-in-law).

Here's another recording, not so clear:

http://www.youtube.com/watch?v=Ad22clb4UWo