To answer the question, Air Canada already goes to apron 2 for spray so it's negligible difference for them. For eastbound WestJets that will likely go off the east side anyway, negligible difference. For westbound WestJets that theoretically go off the west side, I'd estimate it to be maybe ~10 additional taxi minutes. I'll have to see how it plays out in terms of traffic movement on the field... but they're used to this on the daily at YYZ. Couple hundred pounds more of taxi gas that they could just save anyway if they turned off their APU during turns like every other modern airline.
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