Before this degenerates into an unregal willy waving contest, remember that Peel have taken a huge, but calculated risk in developing DSA, pumping millions of their own cash and a lot of Government and EEC development grants, into the place.
Equally, LBA has had an enormous sum spent on developing the airport, initially with ratepayers cash and over the last 20 years or so, private equity and a lot of luck (like finding a commercially viable coal seam when excavating for the main apron).
Either way, both DSA and LBA are still run by British companies who have spent/risked a lot of their own money in ventures that don't necessarily provide a guaranteed return, even in the best of economic conditions.
They both have provided employment for large numbers of local people and new trade for local businesses, they've also provided career opportunities that otherwise would not have seen the light of day in previously economically depressed areas.
Good luck to them both.