Southampton route
I'm mindful that the Eastern brand isn't well known in Belfast. Searching for flights to Southampton you either check Eastern Airways website or online travel agents who seem to have their highest classes of inventory at very high prices example stg 254 one way for the near dates that I checked, also looking at September the same well known online travel agent shows no availability. In my opinion I don't see Eastern as bring the brand to drive this route forward, its needs a well known brand like Aer Lingus Regional or Loganair etc.