DL reportedly holds an equity stake in GOL as well. So they are making money off the deal a couple ways.

As far as I know Ex-Im Bank makes money and has been around since the 30s. I don't know what the rush is to get rid of them.

I'm assuming though the reason DL is making a stink is because the loans allow foreign competitors to buy Boeing products at relatively low interest rates. Most likely at lower rates compared to DL (DL's credit isn't exactly stellar).