Can I pay partly with Business Rewards Miles and partly cash to reduce the fare and/or Miles needed?

No, all tickets must be paid for using the available payment methods. For Business Rewards Award bookings, only taxes and surcharges can be paid for using available payment methods.

Do I have to upgrade all passengers in the booking, or can I just upgrade one?

Can I pay for a Business Rewards booking with my credit card if I am not travelling myself?

If there are multiple passengers on my booking can I just upgrade myself?