Fly with ease on Delta Air Lines (DL) by following these simple steps to check-in for your flight. Skip the lines and check in online through the Delta Air Lines website or mobile app. Online check-in opens 24 hours before your scheduled departure and closes an hour before take-off. Just enter your booking reference or confirmation number and passenger details to complete the process. Delta offers self-service kiosks at most airports. Provide your information, and the kiosk will print your boarding pass instantly. Remember, Delta Airlines check-in policy may vary, so review their guidelines before you travel. Must visit Airlinespetpolicy website to get more information and also get human support by helpline number.