hot air balloon

Hi Dr. Bill,
I am a writer and I am currently working on a book about teaching sign language to hearing babies. I realized that in all of the classes I have taken on the subject and in all of the research I have done, I have not come across a sign for "hot air balloon." Is there such a sign? If so, could you possibly explain its formation to me? I greatly appreciate your help with this matter!
Sincerely,
Teresa R. Simpson
Memphis, TN
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