There are 15 other airports in the UK serving over 100K but less than 1M pax p.a.
There are also several others in the South of Ireland.
These airports must have similar viability problems as Derry. How are they funded?. How much are their losses.
Plymouth airport closed in 2011. Blackpool was busier than Derry with even 12 international routes but closed in 2014 (since reopened but with just 30K pax in 2015).
Extinction is a real possibility.