Originally Posted by
lsquare
Can an AFKL STE+ access a Sky Club if flying Canada-US-Caribbean/Puerto Rico? DL's website says no SC access if flying US-Caribbean/Puerto Rico.
Canada yes.
Caribbean no (SkyTeam defines, for lounge access purposes, US-Caribbean as "not international").
So a Canada to Caribbean via US itinerary (e.g. YYZ-JFK-SJU, at least if YYZ-JFK is DL operated) would grant an AFKL STE+ in any cabin (conceivably even Basic, though there's not really a way to force a recalcitrant dragon) SkyClub access. DL STE+ would have to be traveling in F.
Flying Blue would consider both legs to be international (so 30 XP one-way in F: not a bad XP run by North American standards).