Well, first off all, two US paassenger airlines are already involved, UA and NWA. They have been giving Airbus input on the plane ever since it's conception, about five years ago(in it's current form that is). UA will order this plane simply because unless the Sonic Cruiser is availible faster than Boeing says it will be(which it won't be), UA is going to be at a huge competitive disadvantage to QANTAS which is it's primary competitor on the LAX-Aust. route. United I believe currently has three daily flights down under, and with five percent growth for each year into the forseable future, the A380 will have no problem being filled to the gills(that's around 525 pax, not 600) by 2006.
Now secondly, check out where your shoes are made, how about the components in your car (if it's an American car it's probably made in Mexico altogether). It has been claimed that a higher percentage of Airbus' planes are from America than Boeings, although the numbers fluctuate. Right now around 40% of any given A3whatever is made right here.
Despite that, what is good for the rest of the world is gonna be good for the US. When we ship manufacturing jobs overseas, initially jobs are lost. However, the newly employed overseas can now afford to purchase more expensive American goods, this in turn benifits the whole global economy. Just think about the economic expansion of the last eight years, it wasn't just computers that drove it. It was sending jobs overseas.