Just about every scheduled operator in the UK has run services to the Channel Islands over time. It was a particularly popular destination for those airlines which ran domestic services aimed at business travellers, as it peaks opposite to business travel peaks - at weekends in particular (certainly in summer), and, on weekdays, even with prop aircraft, an early morning domestic business round trip from somewhere to say Glasgow and back could then fit in a late morning flight to the Channel Islands before further afternoon/evening business destinations.