MONTREAL/TORONTO: Air Canada’s unionized flight attendants reached an agreement with the country’s largest carrier on Tuesday, ending the first strike by its cabin crew in 40 years that had upended travel plans for hundreds of thousands of passengers. The strike that lasted nearly four days had led the airline that serves about 130,000 people daily to withdraw its third quarter and full-year earnings guidance.

Air Canada grounded most of its flights in response to a strike by its flight attendants. Here's what it means for airline passengers in the U.S.

Flight attendants walked off the job around 1 a.m. EDT on Saturday. Around the same time, Air Canada said it would begin locking flight attendants out of airports.