Yes, you must still check in, even with an Eticket. An Eticket is simply your "proof of purchase" and seat reservation stored in the airline's database; the check-in process is what generates your Boarding Pass, which is the actual document required to clear security and board the plane. In 2026, most airlines allow you to check in via their app starting 24 hours before departure. A supportive peer "international" note: if you are flying between countries, the check-in process is also when the airline verifies your passport and visa data. Even if you have a digital QR code on your phone, you still need to "complete" the check-in steps to confirm you are actually traveling. If you fail to check in by the airline's deadline (usually 45–60 minutes before takeoff), your seat may be given to a standby passenger, and your ticket could be canceled as a "no-show."