It may be worth remembering that the business case for Doncaster Airport was based on a huge proportion of the traffic - from memory it's around 80% - being simply stolen from Manchester, LBA, EMA and Humberside. That's a clear indication that we have too many airports. If Peel's vision of attracting lots of airlines away from existing airports - KLM and Humberside are a notable example - hasn't worked, and the 'new travellers' bit of the market has dried up, there's nothing left.
In this context DTV's clearly one of the 'stolen from' airports.
NS