Originally Posted by sethb

No, it's specifically allowed by the rules, which intentionally refer to "premium cabin" rather than "F".

It might be necessary to SDC to a connection, then SDC to the desired connection if it isn't allowed by the fare rules; however, that would cost two SDC changes for the non-elites.

Originally Posted by sethb

Phone and ask politely. Be prepared to point out exactly where on Delta's web site it says you can so long as the seats are available.

Originally Posted by kjnangre

I book SFO-DTW-YUL and SDC to SFO-JFK-YUL. Same thing on the return. I book the earliest flight in the morning and then call in (exactly) 24 hrs before my booked flight