Huh???

What does AC have to do with Mileage Plan? In Mileage Plan, you earn a minimum of 500 base miles on most Partners. Everytime I fly the 337 miles LAX<->PHX on AA, regardless of fare class, (B excepted; it doesn't earn in Mileage Plan) I earn at least 500 EQM and 1250 RDM as a 100K. Make it a connection LAX-LAS-PHX and you earn 1000 EQM & 2500 RDM. An AA, O class, 25% earning, flight has a base of 85 miles but still earns 500 EQM. The Elite Bonus is based on the base miles. If what you said was correct, then the flight would post as 125 EQM (on a base of 85 miles???) & 313 RDM for a 100K. The base is the multiplier × distance flown, not the multiplier × the 500 minimum. If that were the case, all base figures in the account activity would be 125 for sub 500 mile flights.

You are contradicting yourself by saying that there is no minimum 500 EQM on flights that don't earn 100% but also say all flights less than 500 miles earn 125 EQM on a 25% fare class. Which is it? "Anything under 500 miles should be multiplied to the earnings rate." What happens when the flight earning less than 100% is greater than 500 miles?

BA flights, as does AA flights, earn the 500 mile minimum. To ensure flight credit, the two-letter airline code (BA) must precede the flight number (for example, BA XXXX) on your ticket receipt or boarding pass.

Earn 500 minimum miles on flights shorter than 500 miles. No miles will be earned for classes of service not listed above.

There is nothing saying that for a base, less than 500 miles, you don't earn the 500 mile minimum. EQM is also RDM so there is no need to differentiate. Conversely, you earn 500 RDM on flights less than 500 miles, which is also EQM towards status.

James