If you have a normal sized runway then you start to chip away at EDI and the market segments again making it harder to invest in world class facilities.
It's bad enough having EDI vs GLA without trying to big up DND. The one thing we don't need is another commercial airport in the central belt. DND has never been commercially succesful and with EDI so close makes no sense in tryin to be. If Loganair of all people cannot make a go of it, there's no point in using taxpayers money to subsidise something which has never and cannot make money. It's not the Highlands and EDI is moments away. Dundee airfield would happily remain open I am sure but not for airline passengers.