Originally Posted by Softpayman

In general I agree with this analysis. However there are some subtle differences that would at least open the door to the possibility of not doing the 12 hour aircraft sit.

Even with the XLR this isn't a NY/BOS to deep S.America aircraft. Florida to NE Brazil definitely, to the Brazilian population hubs of Sao Paulo, Rio, & Brasilia yes. Possibly Buenos Aires/Santiago.

Those could be evening departures (5-8pm) that land past midnight in those cities. Plane sits for a few hours for an early morning departure back North. Now being a narrow body, this AC could run more economically on a FLL-JFK/BOS flight to follow. Keeps aircraft utilization high which JB likes to do.

Look more at what American does with it's 757 out of Miami rather than what American/United do with their 777's and 767's out of the NY area to S America as an analogy to what we'd do with an XLR. American 757's leave MIA at 7pm and 4pm for Brasilia and Santa Cruz for example. Other Brazilian carriers do fly daytime to the US as well.