Losing your confirmation details doesn't mean losing your reservation. To recover a lost American Cruise Lines cruise booking ID, start by checking the confirmation email sent at the time of purchase — the booking ID is usually listed near the top. If that email isn't accessible, log into your American Cruise Lines account online, where past reservations are stored under "My Bookings." Still stuck? Contact American Cruise Lines directly through their official website using the name, travel dates, and payment details used at booking — this lets their team verify your identity and retrieve the booking ID securely, without relying on unofficial third-party sites.