One of the members of our touring group is

95,382 - banked
2475 - flying on 31st
--------
97,857

We need 2143 miles

I will buy a reservation, use the maximizer etc to get her over the line, but I cannot seem to find a maximizer or ticket purchase that allows me to just buy her what she needs. They offer me the right to buy 2000 of them, or 5000, or 6000 etc. I'd like not to buy more than I have to for her. Even 2500 is better than 5000 etc