When shoppers select Klarna to make payments to airlines, you have to include specific travel details in additionalData and lineItems of your /payments or /sessions request.
Additional data
Select which endpoint you are using:
Line items
Select which endpoint you are using:
Capture payments
Because flight bookings are locked when the payment is made, immediate capture (also referred to as auto-capture) is supported by Klarna. However, the default manual capture flow is also supported.