Do I need to give my passport number at the time of booking?

No, you can make a booking without your passport details. Your passport number may, however, be needed at the time of online check-in.

Please note that if you are travelling to, from or via the United States, you need to give Advance Passenger Information (passport details and the full address of your first night's accommodation in the US). You can add this information to your reservation through Manage booking.