STORY: Air Canada expects to cancel the majority of its estimated 700 daily flights on Friday ahead of a planned Saturday strike by unionized flight attendants.:: FileThe country’s largest carrier operates over 250 aircraft on flights to more than 65 countries.

Air Canada said on Thursday it expects to cancel several dozen flights by day's end and around 500 flights by the end of Friday affecting 100,0000 passengers, ahead of a planned Saturday strike by its unionized flight attendants.

Air Canada started canceling flights on Thursday ahead of a possible work stoppage by flight attendants that could affect hundreds of thousands of travelers.