There are actually four flyers – in addition to Weeks, Friedkin and the Greenhill (now Mid America Flight Museum) examples, the Erickson Aircraft Collection also owns/operates J2F-6 (N3960C) – the EAC example might actually be the most flown, recently, of all of them.

N8563F was also at least briefly a flyer in Anchorage, Alaska, when owned by the Alaska Aviation Heritage Museum (a 20 year restoration, which first flew in 2007, but had some damage following a landing in 2008 (not sure if it ever flew after that)). It has since been sold to “Skyfire Corp” (which I understand to be David Arnold) and its airworthiness certificate has expired.