Too few passengers
Flybe's decision makes it absolutely clear – Manston does not have the makings of a successful passenger airport.
The current owners of Manston airport (Infratil) have always pushed the story that they want Manston to be a mixed passenger and freight airport. We know that Ryanair and easyJet have both examined Manston airport carefully in the past. They both came to the same conclusion: if Manston airport was 10 miles further West, it would have a large enough catchment area to have the potential to succeed as a passenger airport.