Presumably if Porter has its way and gets it jets then Porter is well-positioned to take some business from Westjet, no?
Some folks who may be sympathetic to Porter and may find the C-series to be inoffensive are likely to object more strenuously to WJ's 737s, no?
Surely this is just be a bit of theater on the part of WJ, hoping to stir up additional opposition to Porter's plans, no?