Air Atlantique operated a short-lived £29.00 fare route between Southampton and the Channel Islands in 1988, operating a leased HS748 (G-BEKG). When it was due a two or three week maintenance check at DanAir, the route was filled in with a Dakota (G-AMSV) and Cessna 404 (G-EXEX?), which was trouble-free except for obviously not being able to keep up with the same timetable. I was the engineer and usually flew in the Dak's jump seat when the last flight was terminating at Jersey. We'd occasionally ask one of the pax to delightedly take my place and I'd equally-delightedly sit at the back with a beer.
Back to the 748 - on one occasion a new employee double-booked a flight and 96 pax arrived for 48 seats. A Shorts 330 was quickly sub-charted to help out and then refused to start once it was loaded. That was an interesting morning...