Fly

The chopper is leaving the camp site with the sick skipper and his wife inside, and the narrator says:

"*But all's fly with the tents*, and John and Sandy settle in for their unexpected flight back to Auckland".

I have a feeling that "all's fly with the tents" has some idiom hidden in it, but which one?

Thank you very much

Sounds like a youth slang thing to me. I think it means everything is OK with the tents. Urban Dictionary has a couple of likely entries for "fly." including -- cool. www.urbandictionary.com/ define.php?term=fly&f=1