1. Have you nose in somebody's business: think literally about putting your nose in something. If you constantly talk about someone's love life, then you have your nose in his business. He might say: "Keep your nose out of it!" (= mind your own business) The phrase is used with the airbus as a pun, referring to the nose of the aircraft. 2. to guzzle (down) = to eat in large amounts and very quickly: He guzzled down his meal before you could blink. Illegal handouts refers to the handouts of the government in the wake of the recent crisis. It looks like Boeing is getting a very large amount of them. 3. Cattle class is a rather old term. In a train you have first class, second class, and third class. Then there are the cars where the cattle travel. If you travel lower than third class, we then say cattle class. 4. You will need to post more.

I agree with Eliot's comments, just adding some notes: 1. Pigs are fed from a trough, so the image is that Airbus is acting like a greedy pig at feed time, when it comes to government assistance. 4. "Source" in this context means a news source, or source of information. So the report doesn't want to say exactly who the source of information is, only that they are from mainland(?) Europe.