Consolidating DTV with Newcastle and improving surface links (Rail, Air-Coach, A1(M) and A19 links) from all DTVA catchment areas would bolster case to expand services and airlines serving the whole North East region via Newcastle International.
Ever tried using the A1 between Chester le Street and Metro Centre during the rush hour, the recent improvements have not made much difference to travel time. Try 90 minutes from Teesside, that's more realistic.