Cloud nine

Posted by Dusty on January 29, 2003

My 5th grade son is studying idioms. He needs to find the origin or "on cloud nine". If anyone could please help us. I have searched and found hundreds of idioms but not the one we need. Thanks for your help.

Cloud nine R. Berg 01/29/03
- Cloud nine ESC 01/29/03
  - Cloud nine john doe 01/30/03
    - Cloud nine R. Berg 01/30/03
      - Cloud nine ESC 01/30/03