Originally Posted by
chris78cpr
If it gives me 100% and then 50% COS bonus what will my EXP bonus affect? I guess it will give me 100% of the original miles flown and not 100% on the original miles and the COS miles?
Correct. Note that not all OW partners earn you the Plat/EXP 100% bonus, notably BA and JL (also I think MA and not sure about RJ.) Sometimes the use of codeshares can circumvent the problem.