<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Ksimp:
The minimum then is still 500? So if a LHR-PRG flight is 644 miles, it's then 500 miles + .25 of the 144 miles, correct?</font>
Incorrect. For the cheap fares, it's the greater of 500 miles *or* 25% of actual miles.
Your assumption might be true of BA if it had kept its old (3-4 years ago) system of 500 miles bonus on top of actual miles.