Originally Posted by
BusTrav8yrs
It is not an "error", you can book as many seats as you want, in fact some larger PAX have to book two seats on some airlines, I recall years back a guy was doing it to have a seat for his cello, but was fighting with NW when they wouldn't credit him for the miles.
This is wrong and terrible advice. The DL COC specifically prohibit doing what you are advising. If you read the terms, you will see that:
Delta prohibits duplicate, impossible, or fictitious bookings, including but not limited to multiple conflicting itineraries for the same passenger on the same day or bookings with connections that depart before the arrival of the inbound flight. Delta reserves the right to cancel any such booking which has not been ticketed, and to cancel and refund any such booking which is ticketed at a refundable fare.
If one wishes to purchase a second or third seat, one must call DL and book those for that purpose. The seats are assigned to a coded name so as to avoid the COC cancellation.