I'm tempted to do a great big DITTO to ColumbusGuy's review, but I will try to throw in some original(ish) thoughts. I found it interesting that Frank didn't tell Zach the plan until they were en route to the airport; presumably he knew Zach wouldn't show up if forewarned.
I, too, wondered about the bathroom sex on the plane. Is it Brad's that has the bedroom? So many private jets...how does one keep track of them? Haha! Regardless, Stef should be ashamed of himself for making his in-flight guests wait in line to have their assignations in the bathroom like common coach travelers. And what if Claire had needed to pee?
Finally, in response to your response to Ddk, below, fireworks may not be appropriate for Christmas, but they are a longstanding New Year tradition. *hint hint*
Merry Christmas! And thanks!