Targer> Explanation for "Cloud 9"

[Allison G Kaplan <akaplan@BRAHMS.UDEL.EDU>]

Group,
This is for a faculty member here at the University of Delaware:
        Where did the phrase "to be on cloud nine" come from?
He knows it means to be happy but what was the source?

I told him if anyone can find the answer it will be someone from LM_NET.
Hope someone out there can help me. Please respond directly to me and
I'll post the answer.

Thanks in advance,
Allison G. Kaplan
Education Resource Center
University of Delaware
Newark, DE 19716-2940

akaplan@brahms.udel.edu