Presumably from European governments in the case of Airbus and from the Brazilian government in the case of Embraer.

In the late 1990's Embraer and Bombardier sued each other in the WTO which found both governments guilty of subsidies.

Embraer is preparing to sue Bombardier/Canada again: http://www.reuters.com/article/embraer-bombardier-idUSL2N18D...