I was Ops D/O until 1986 at LHR for BMA and we handled Brymon Airways who's spiritual home was PLH.
They had a twice daily HP Herald from/to LHR-NQY taken over from BMA in 1977 with morning and evening peak slots, upgraded to x 3 daily with a lunchtime one via EXT and/or PLH when the 50 seat Dash 7's came along in 1981.
There was the Twin Otter LHR-PLH service (3 or 4 times a day IIRC some via EXT) with interline pax connecting onwards to the ISC St Marys especially during the summer (also some pax went via NQY)
The Dash 7 was also was put on the LHR-PLH route (LGW too?) -
but when? can someone help.
PLH the home of Brymon - The transformation of Roborough from a tranquil provincial aerodrome into Plymouth City Airport PLH began in March 1975, when Brymon Airways took over the running of the site on a 125-year lease from the City Council.
In the 70's Brymon started regular services from PLH and built up a number of routes taking in LHR, the Channel Islands and to the Isles of Scilly ISC.
As the decade unfolded further destinations were added to include regular flights to Morlaix, Cherbourg and Cork.
In 1978 Brymon were given the go ahead to also fly to Gatwick and the following year a new Plymouth to Birmingham service was inaugurated.
Brymon boss Charles Stuart running through the passenger growth from 1981 to 1985 showed
an annual 14% rise on both the LHR routes from the SW.
Some nice old photos here -
Brymon Airways at Roborough, Plymouth Airport
PLH summers day with 2 young spotters