Originally Posted by docbert

Might help to include where that's a quote from. (Hint: it's on Delta.com, so probably not all that relevant to this thread)

The equivalent quote from the United.com website Often1 mentioned is :

"Yes, when a change can be confirmed, provided the new routing is permitted by the fare and no changes to the origin or destination airports. You may not, however, change routing when standing by."

As for the bag question, "If you checked baggage on your original flight, you will need to complete any changes at least 60 minutes before your new flight’s departure to allow time for us to move your baggage to the new flight."