Originally Posted by Often1

Here are the published rules for SDSB. Note that while SDSB is not available for non elites on Economy MileSaaver and BE, there is no mention of Web Specials as an exclusion. Best to have a physical print out of the rules handy.

• On select routes operated and marketed by American or American Eagle, based on availability
• May be confirmed up to 24 hours before the new flight time
• Non-refundable, non-transferable and not available for Basic Economy fares
• Standby is not available for non-elite members traveling on an Economy MileSAAver award ticket
• No changes to depart / arrival airports, number of flight segments, connection cities or from a through flight to a connecting or nonstop flight
• Customers on Basic Economy fares don't receive elite status same-day change / standby benefits
• Offer is made at our discretion and subject to change or termination at any time