And one last thing, keep this in mind please, because you are probably thinking about getting a fast command and leave! You pay for the upgrade by yourself, but still it is possible to fail the upgrade, and you can not get your money back! Keep this in mind please, this is serious! It is not "I am paying for it, so you will let me pass" training. In 2014, at least 2 expat FO fail the 321 upgrade trining.
I confirm, not only VNA do that but some others airline in Vietnam...
