Changing Economy Saver Award to Business Saver Award
I currently have an Economy Saver Award booked for travel in February. I have been waiting to see if a Business Saver Award will become available and am wondering if it does, will I be able to upgrade to Business by just using more miles, or will United force me to pay a change fee of some type in addition to the extra miles. If there is a change fee, how much will it be? Any help is appreciated.