diff --git a/bookings/flights-ms.md b/bookings/flights-ms.md
index 14f2bf5..2b24636 100644
--- a/bookings/flights-ms.md
+++ b/bookings/flights-ms.md
@@ -41,5 +41,7 @@ aircanada.com for the return leg — bag purchase and seat selection.
 **Airport timing:** international check-in — bags dropped and boarding pass ≥60 min
 before departure; at gate ≥30 min before.
 
-**Still to do:** pick return-leg seats · pay the bag fee (CA$69 each way) at check-in
-or add in advance.
+**Still to do:** pick return-leg seats · pay the return bag fee at AC online check-in
+(opens 7:30 PM Oct 3) or the SFO counter — advance purchase unavailable on this
+UA-issued ticket. Expect **CA$69** (the ticketed rate); AC's site shows its own C$50
+rate, so the quote at check-in may come in lower — pay whichever is offered.