Yes, Northwest Airlines does offer online check-in for its passengers. This convenient option typically allows travelers to check in from the comfort of their own homes or while they are on the go. Passengers can usually access online check-in starting 24 hours before their scheduled departure time. The process is simple and user-friendly, guiding you through the necessary steps to confirm your flight and select seats if available. Additionally, travelers can also print their boarding passes at home or save them to their mobile devices. For the most accurate and current information regarding online check-in, as well as any specific details related to your flight, it is advisable to refer to Northwest Airlines' official website.