Originally Posted by
ty97
Originally Posted by
vsevolod4
The big question is parity at time of conversion. Lifetime US miles are more restricted than lifetime AA miles.
It is a bit more complicated than that. There is
currently parity in the AA and US systems for counting MM. Both use BIS miles only.
Except it's stated upthread that US does not even credit BIS miles on partner metal for MM proposes, whereas AA does. So while the disparity is nowhere near what it would have been had AA still credited all sources of miles, there is still slight disparity.
Cheers,
LBBZman