Surely not "because NSA" entirely.

It could also be because the USA has stopped a big sale from Embraer to Venezuela years ago.

And earlier this year the USA annulled a contract that Embraer had won to supply Super Tucano to the US Air force in favour of a local plane maker.

EDIT: http://www.forbes.com/sites/kenrapoza/2013/03/15/u-s-air-for...