I think the overall big picture here will be how fleet movements between WS (mainline), WO (Swoop) and WG (Sunwing) will be managed. It could well be that future WO orders will add to the WS fleet and the existing aircraft will go to WG without being reconfigured to 174 seats. I can't see WS suffering a minimum 8% cost disadvantage by flying 174 seat aircraft instead of 189 seat ones on ULCC orientated point-to-point routes where they compete with Flair and other ULCCs.