Fuzzbear....the PLH departure was never intended to be a direct service to NCL....the short runway would greatly restrict offered loads (especially in the temperatures we are currently experiencing) and I'm not sure that the demand would be there.
As for EXT-NCL.........the Southwest is probably adequately served on NCL routes as EZY do a number of rotations from BRS so it would be a bit of a gamble to offer the Flybe service which would have to be a min 2x daily service to gain any credibility.
The PLH to CWL continues to NCL, but also offers the opportunity to connect with LCY which a number of PLH pax use as they find LCY more convenient than the Air Southwest LGW service.
All catering and re-fuelling (way cheaper) is done at Cardiff.
cheers
rabbs