I was at Ronaldsway on Monday and saw two people get kicked from the London City flight because the aircraft had been down sized from that originally planned (presume that was the 328 replacing the ATR).
In fairness to Aer Arran, both pax turned up dead on check in closing time and I think one may have been after the time, but still it doesn't make them look good when there are more people booked on the flight than the aircraft can carry!