I would of though when RE ordered the AT76 they would of perhaps ordered 2-3 AT46 for the thinner routes. E.G IOM/KIR/BLK and quite a lot of the time SEN/BOH/BRS/SNN etc. There a plenty of routes that operate with the 42's and I would think for there brand image, pax are not going to like occasionally travelling on the nice 76's then having to go to EIEHH! Not sure how much work there planning on getting out of there current 42's