Here is what I keep coming back to: does this mean at least one person in each “world” has a hat? Because the Queen of Hearts and Regina knew each other. Is it possible the other worlds have traveled to FTL? And what would happen if they try now? What if they are searching for the inhabitants of FTL?
As far as how did Regina and Henry Sr. get back to FTL…my guess is that by exiting through the door of the world from which you originate is the same as “flying” up the hat. Your door will take you out of your hat and back into your world. I would have loved to see it though, for confirmation.
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"He was a lot of things to me" "The only conclusion was love"