SEN Catchment
SEN had a catchment started in the business case for developing the airport of 600,000 people.
It's a great little airport, though the challenge is they are very reliant on traffic originating in the catchment, and the mainstay of routes has been sun spots geared towards leisure traffic. Sadly with easyJet out they are heavily reliant on Ryanair and sadly, given their enormous presence at STN they'll not be prioritising SEN any time soon.
SEN will need to draw in a new based carrier such as Wizz or potentially Blue Air... Outside of these it's hard to see them getting back to significant scale in the next 3 years...