itinerary: add LK Kansas City side trip

bookings/flights-ms.md

@@ -1,7 +1,8 @@
 # Flights — MS & LK
 
-LK flies with MS on both legs (YVR ↔ SFO). She leaves the group Sep 22
-and rejoins Sep 27 around 5 PM in LA.
+LK flies with MS on both legs (YVR ↔ SFO). She flies to Kansas City on
+Sep 22 (flight details TBC), remains away from the group, and rejoins Sep 27
+in Los Angeles after returning her LAX rental car by 6:30 PM PDT.
 
 ✅ **Booked Aug 31, 2026 — United confirmation `OMK75H` · Air Canada ref `ADSPID`**
 ([eTicket PDF](United_Flights_YVR-SFO_OMK75H_eTicket.pdf))