Following the closure of the helicopter service from Penzance Skybus operate return services from St Mary's to Exeter up to 5 times daily during the summer.
But a full DHC6 cannot operate EXT-ISC-EXT without a refuel, Skybus will be ''W'' patterning it whereas it operates EXT-ISC-LEQ where it has a refuel.
I know, I worked for the previous ISC DHC6 operator, round trip PLH-ISC-PLH was OK but EXT was simply too far and needed to be ''W'' patterned with NQY.