<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by rbAA:
Whether it's a codeshare or BA flight number, the mileage should be the same, in this case LHR-FRA, as the 500 miles minimum kicks in. </font>
This is no longer necessarily the case. Discount economy has a 125 mile minimum see:
http://www.flyertalk.com/forum/Forum71/HTML/020341.html
- Simon