So, bought our tickets to fly to Vancouver via WestJet. Turns out, panniers are going to be carry-on. The bikes are classified as our “one luggage” item which flies free (under 50 lbs). Kudos to WestJet who treats its customers this way, unlike the American fliers which charge $300+ per flight per bike. Air Canada is still decent at $50 per flight ($100 return), but who can argue with WestJet.