FB agent (France helpdesk, the main FB number) confirmed that KL4103, if bought from KL, would earn level and award miles although operated by MH. this is in line with what you get if you search for KLM rules on flying blue (
http://klm.com/travel/nl_en/flying_b...ners/index.htm)
"Flying Blue members can earn Miles on all KLM-coded flights as well as on KL operated flights with a Flying Blue partner prefix."
contrast this with the information tlr cites from the FB Luxembourg helpdesk agent on
http://flyertalk.com/forum/showthread.php?t=518788
meanwhile, KLM's booking engine told me that on a full fare ticket on KL4103 i was eligible for upgrade with miles. FB france agent said this is not true, so this info is wrong on the website.
as i probably want to upgrade, i will buy the KL-metal flight so won't have the opportunity to see how the MH flights are handled by FB.
best,
rishab