For obvious reasons, ET has always been very fuzzy on specific dates and times. As far as I know, there is no way to know exactly when ET filmed the famous HKS plane interview, other than it was prior to the Monday after her death, when it aired.
FWIW, there is kind of a timeline marker I found in my notes where Steines wrote in his blog that he and KE arrived in FL at 1AM on Fri morning.
After that, I don't know about the Bahamas flight with HKS, but we can work from that, anyway.