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			It doesn't really exist anymore. 
 If you book a flight with AC for their cheapest fare, then show up and try to fly standby on a more expensive rate, you can only do it if you pay the fare difference.
 
 Westjet charges a standby fee ($50 I think?) to try to do it, but like ECF said it's a pain in the ass. You're better off scouring around looking for cheaper fares.
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