Originally Posted by
flyerCO
It is. Even with award tickets DL still prohibits booking tickets you don't intend to keep. Plus it could be seen as attempt to manipulate inventory on a flight.
I would assume that award tickets should be an exception - because they are fully refundable. I'd expect them to cancel overlapping award tickets.
While I know the CoC allows Delta to cancel my revenue tickets, I'd be pretty mad if they cancelled duplicating revenue tickets since you'll pay a fee for changing the flight you didn't take anyways.