Moderator, Air Canada; FlyerTalk Evangelist
Join Date: Feb 2015
Location: YYC
Programs: AC SE MM, FB Plat, WS Plat, BA Silver, DL GM, Marriott Plat, Hilton Gold, Accor Silver
Posts: 16,773
It will likely error out when you try to complete the booking. Matrix caches availability, so it's likely that it simply hasn't refreshed availability recently.