Most airlines offer web/online check-in.
To register online, simply:
Go to the airline's website
Click on "My Booking" or "Online Check-in"
Fill in your name and PNR/booking ID (typically 6 characters) from your booking confirmation email
Follow the steps to proceed with check-in
If you encounter a problem, do not hesitate to contact us by chat or e-mail at firstname.lastname@example.org.