Originally Posted by
ianmanka
I leave on this trip in about a week and a half.
If I leave the FF number empty on the ticket, could I hold on to the ticket, and apply for mileage credit if/when CO/UA updates their earning charts? Or will I earn them at the rates when I flew the segments, rendering this strategy useless?
You earn miles as they were when you flew. Not when UA/CO updates their charts.