Moderator: American AAdvantage
Join Date: May 2000
Location: NorCal - SMF area
Programs: AA LT Plat; HH LT Diamond, Maître-plongeur des Muccis
Posts: 62,948
I'm guessing whether or not your Maclaren double stroller is accepted or not might depend on two things: actual stroller weight (the Maclaren Twin Triumph weighs 23 lb / 10.5 kg) and how much of a stickler the agent is.
IMO, but not experience other than casual observation at many gates, you'll likely be fine. In a case where the gate agent has the time and is a stickler, they will most likely follow the stated rules and gate check your stroller as they would excessively large baggage or baggage that exceeds the aircraft bin capacity. Those can exceed 40 lb / 18 kg.