Aeroplan website still states that same-day standby is no charge for confirmed Business Class ticket holders...

32. Same-day standby at the airport is permitted for earlier flights within North America-free of charge-for passengers holding a confirmed Aeroplan seat on Air Canada and/or Air Canada Jazz in the Executive cabin only. Departure and arrival cities must be the same as the confirmed flight. Same-day standby must be requested at the departure city, once the member has checked in for a confirmed flight. Additional restrictions may apply.

33. Same-day confirmed change at the airport is permitted to either an earlier or later flight on the same itinerary for a charge of $50 (Cdn) for passengers holding either an Economy or Executive cabin confirmed Aeroplan ClassicFlight or ClassicPlus flight reward on Air Canada and/or Air Canada Jazz. Same-day changes are subject to availability. No additional mileage charges apply for changes made on the day of travel at the airport.

http://www.aeroplan.com/terms_and_co...tion=rewardair