Doing some research it seems George Soros has a connection to Embraer through Harbin-Embraer Aircraft a Chinese-Brazilian joint venture, and Hainan Airlines, which Soros owns a significant stake in.

The link you describe is one easily found on Wikipedia:

Hainan Airlines announced an order to purchase 50 Embraer ERJ-145s and 50 Embraer 190s with a total value of (at list price) US$ 2.7 billion. Deliveries commenced in September 2007 for the ERJ-145s. The 50-seat ERJ-145s were produced by the joint venture Harbin Embraer Aircraft Industry (HEAI), in the city of Harbin. For the Embraer E-190, deliveries started in December 2007. The 106-seater aircraft is configured for single class service and is manufactured at the plant of São José dos Campos, Brazil. Due to the financial crisis and huge loss in the year 2008, the number of orders for the 50 seater ERJ 145 was reduced to 25 from the original of 50; the Embraer 190 order of 50 was not reduced.

Meanwhile, your link also includes information that rebuts the criticism of jobs going to Brazilians rather than Americans on this contract:

While losing the contract could lead to job losses in Wichita, Embraer has made a compelling case for U.S. job creation in its bid proposal. The company said it will build the Super Tucanos in Florida in partnership with prime contractor Sierra Nevada, a U.S.-based technology company. The companies say they'll use more than 70 U.S. suppliers and create more than 1,200 U.S. jobs.