Join Date: Jun 2005
Location: PBI | Formerly CLT, LHR & AMS (with just a bit of PSP)
Programs: Proud AA CK Spouse, AA Plat, HH Diamond, BonVoy Titanium, Caesars7* (comp), Wynn Black, HR Icon
Posts: 8,208
I've had similar messages when I don't have a linked return ticket to the USA. Most of the time when I just had a final BOS-AMS segment (or one way ticket). Always had to do with visa verification (and/or verification of a return flight to the USA).
Though, in these cases there usually is a possibility of entering your return date to the USA; and then it allows OLCI.