The report is trying to make the case that new UK regional services would be possible, but it looks like magical thinking to me. For example, it proposes that a new Durham Tees Valley service would be feasible, 4 times a day, with 450,000 passengers a year by 2050. Most of these would be connecting because "the London-bound market is relatively weak given the level of rail competition", but all the same, despite this 4/day 450,000 passenger hub connection, "the viability of other hub services from Durham Tees Valley is not expected to be significantly affected." Hmm. That's convenient - let's just avoid the displacement argument by assuming there is none.
It also bangs on about 6 times/day to/from DND, a service currently propped up by a PSO - and that's to/from STN.
The document is fatuous piece of nonsense with no evidence to back up it's assertions. Their airports advisor has no background in aviation, so this is to be expected.
Airports policy is not the remit of TFL/mayor/assembly, it is the province of central government. Time to stop wasting ratepayers' money.