The reason they mention it was the NSA is because the government wants to capitalize on the anti-american commotion (and it's working).
The real reason is that Boeing is a competitor to Embraer, so transfer of technology would be limited. Boeing simply had a worse, more expensive offer.
And its pretty deserved, and im saying that also as a brazilian, cause: would you trust in the software, hardware and firmware of those after all we know about the NSA revelations? worse yet , if you think you dont have access to the source code, or to modify any part of it, as a pure blackbox..
Would you trust your country safety and security to something that its very likely to be a trojan horse(somehow), after all we know now?
How can you trust your defense to something or somebody you cant trust at all?
(and lets not forget that Embraer was on the NSA espionage files too)
So, this is not "anti-american", but a pretty wise decision.. forgeting all the politics involved in the case.. Its pretty rational
Dilma is crazy to boost the government's image, internal and worldwide, making our country look like a bastion of freedom and democracy, when we both know it's none of that (unless you work for the government).
I agree with everything said about NSA, but we can't be naive to the fact this is going to be used as a PWMD (Political Weapon of Mass Destruction) to justify anything from now on.