Air Canada flight attendants picket at the Calgary Airport to raise awareness about ongoing issues related to their working conditions on Monday. Photo by Darren Makowichuk/Postmedia

Air Canada’s more than 10,000 flight attendants said they’ll strike for three days beginning Saturday after rejecting a sweetened offer from the airline and declining arbitration.

Flight attendants have served a 72-hour strike notice after failing to reach a deal, their union said in a statement. Members voted 99.7 per cent in favour of a strike mandate, it added.

“We have shown up prepared, bargained in good faith, and made progress on some items. Despite our best efforts, Air Canada refused to address our core issues,” the union said, adding it continued to negotiate. “Air Canada’s latest response made

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