That doesn't work because screening will never been good enough that you could be 100% certain there isn't a bomb on board given how small a device it takes to cause serious damage to an airliner. If they were to disregard it, can you imagine the hell to be paid if 125 people died because WestJet was told there was a bomb on one of their planes and ignored it? Goodbye WestJet.
Furthermore, WS391's threat was a 4 minute call talking about a bomb in a specific hold, but WS442's call yesterday was nowhere near as detailed from what I understand. Important to follow procedure when you have no idea what the threat could be.
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