The Montreal-based airline said labor negotiations with its 10,000 flight attendants are at an impasse and warned that the carrier may begin to shut down operations as early as Saturday without an agreement.

Air Canada said it remains available to continue negotiations with its flight attendants as it winds down operations ahead of a potential labor disruption.

Air Canada is preparing to indefinitely suspend most of its flights over the next three days after hitting an impasse in contract negotiations with its flight attendants' union. The union issued a notice of intention to strike,