Tnx! If they're able to add BA from LHR it should be included, correct?
It would be 90k, I will try & explain...
2001-4000 miles are 65,000 miles in F.
4001-6000 miles are 90,000 miles in F.
MXP-JFK is 3,995 miles.
LHR-MXP-JFK is 4,578 miles.
The small BA flight pushes the rate up by 25,000 miles.
You are better off booking 4k/4.5k BA miles to MXP & start the JAL booking from MXP