ZFW i.e. WestJet's relatively dense configuration is not a huge factor for the 787, it's simply Calgary's altitude. Anything over about 20 degrees and they're cooked on long haul. So you either depart at midnight which, at peak summer, doesn't even guarantee it'll be cool enough to not take a big hit... or you operate it in winter only.
Also with only 7 planes and an already absurdly tight 787 schedule that falls apart every day you have to cut or reduce something else to add a new 787 destination anyway.
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