So far, the details of the Airbus ruling have not been leaked, so nothing to comment on in that regard. However, I did have a quibble with this statement by the Economist:
Theoretically the WTO ruling, if confirmed and not over-turned on appeal, could cause a trade war between the European Union and America.
I suppose they mean that the trade sanctions that could eventually be authorized in response to a finding of violation would constitute a "trade war." Another way to look at it, though, is that the current subsidies both companies receive are the "trade war," and the WTO dispute process will, hopefully, resolve things.