Air Canada allows passengers to check in online or via the mobile app starting 24 hours before flight departure. To check in, visit the Air Canada website or open the app, enter your booking reference or Aeroplan number along with your surname. You can select or change seats, add checked bags, and get a digital or printable boarding pass. For international flights, you may need to provide passport details and travel documents. Self-service kiosks are available at most airports and open 12 hours before domestic flights and 3 hours before international flights. At kiosks, you can check in, print boarding passes, select seats, and pay for baggage. After kiosk check-in, proceed to baggage drop counters if you have luggage. Airport counters are available for passengers needing assistance, traveling with pets, or unaccompanied minors. Counters open 2 hours before domestic flights and 3 hours before international and U.S. flights. Baggage drop is allowed up to 4 hours before departure but closes 45 minutes before domestic and 60 minutes before international flights. Check-in deadlines are generally 60 minutes before departure, except at Toronto Billy Bishop Airport and certain bus services where it is 30 minutes. Arriving early is recommended to complete check-in and security. Using online or app check-in saves time and reduces airport wait. Keep travel documents ready and follow specific check-in and baggage deadlines. This ensures a smooth and timely boarding process with Air Canada.