if nationais is an adjective, the answer could also be "if possible, national" because the sentence does not specify what noun the word "nationais" is referring to.
you are right, reported
What does this mean? I don't get it at all.
Remember portuguese is still in beta, if you see a problem report it.
Could "domestic ones" be an applicable translation for "nationais" in this sentence?
Not really. Domestic is "doméstico" with a pretty distinct meaning.
this one is confusing
"Nationals" in this sense makes no sense in English. Unless we're talking BE?
This makes no sense without some context.