Yes, you can absolutely check-in for your flight in 2026 using only your confirmation number (also known as a PNR or Booking Reference) and your last name. Most airlines' mobile apps and website "Check-In" portals are designed for this exact purpose. Once you enter the 6-character alphanumeric code, the system will pull up your itinerary, allow you to select your seat, and generate your digital boarding pass. If you are checking in at the airport, you can type the same code into a self-service kiosk to print your pass and bag tags. If you have lost your confirmation number, you can also use your passport (by scanning the chip at a kiosk) or your frequent flyer number to retrieve your booking. It is a high-value peer tip to take a screenshot of your confirmation number immediately after booking, as this ensures you can still check-in even if you can't access your email or if the airport's Wi-Fi is unreliable on the day of your departure.