Customers who booked an Air Canada flight on or before Aug. 15 for travel on Saturday or Sunday can cancel for a full refund of the unused portion of their ticket, regardless of fare type, through the company’s website or mobile app. Travelers may also opt for a travel credit to use toward a future Air Canada booking.

A bitter contract fight between Canada’s largest airline and the union representing its flight attendants escalated Friday.

Here's what U.S. passengers affected by the Air Canada strike need to know, and why their options and recourse are limited.