This is prob our biggest fear with Swoop and Flair. Flair seems even worse. I assumed it was because the dont have a large inventory of 'spare' planes ,so if something goes wrong you're stuck.
Their prices to Florida can't be beat, and really not sure what 'frills' you get with Westjet. We get free luggage with the WC card on a westjet flight, but a couple of pretzels and a drink arent going to make or break it. Most airlines you pay for luggage anyways as well.
More interesting in seat pitch and leg room differences from other carriers.