What's the Name of That Book??? discussion

I remember reading this book a while back and I remember really liking it, it was a young adult book. I don't remember much of the details from the book but I do remember that there were two main characters, a boy and a girl. I'm pretty sure the girl lived in the sky on hot air balloon type things and they got around from balloon to balloon using ropes. I feel like there was some type of underground fighting or something with robots. I'd love to read the book again and see if there were more than one book I just can't remember the name of it. Help!

Maybe Magonia by Maria Healey?

Sorry, my autocorrect changed the author name. Surname is Headley

The Sky Village by Chris Rettstatt?

Yes, it's the sky village! Thank you