Originally Posted by
azeckel
I've done a lot of SDC recently. Some even between LGA and JFK. I haven't run into fare class availability at all on economy tickets. Even when I'm pretty sure my purchased fare class is less than what was being sold on delta.com. I'm not sure why - could be corporate agreement, being diamond, or just dumb luck.
Keep in mind that even if you have a V fare and Delta.com is selling (say) expensive M tickets, you might be able to SDC if there are still tickets left in the V bucket, but aren't being sold due to advance purchase requirements.