in addition to Hugh Jarse, the APU on the dash is a winner (albeit TQA/B/C). will the REX aircraft be on the ground for a while during summer or are they going for quick turn-arounds?
a heat soaked SF-340 and DHC-8 for that matter are considerably uncomfortable and temperature control is 'critical' in winning pax on this particular route.
'been there doing that', Hoss.