You can pay for extra luggage directly on the airline’s official website using your booking code (PNR):
Find your booking reference (PNR):
You’ll receive your airline booking reference code (PNR) in your confirmation email after booking. You can also find it in the “Order” section of your account by clicking on the booking that you need under the “Booking code (PNR)” section.
2. Go to the airline’s official website:
Use your PNR to log in or find your booking. Then find the extra luggage section
(if available) and book it.
Note:
Fees and baggage options depend on the airline and fare.
If you are unable to add baggage online, contact the airline’s support service for assistance.