It was Eurodirect, I used them myself a few times between BOH - CDG, AMS and BRU. A fleet of Jetstream31 and BAe ATP were used. Sometimes the schedule served both BOH and EXT as a trangle, so dependent on the day, the flight to BOH could route via EXT and vice versa. I remember returning from CDG to BOH several times via EXT, but the outbounds were always direct.
G-OEDG British Aerospace Jetstream 31 EuroDirect AlainDurand ...
https://goo.gl/images/mHUnLA
FF