President Trump’s plan to tack tariffs onto $11 billion in European imports isn’t a new front in his global trade war. It’s the latest skirmish in an ongoing battle between the planet’s biggest plane-makers, which began the same year the president started firing contestants on NBC’s “The Apprentice.”

The tariffs have the potential to roil negotiations between the European Union and the United States, which have already stalled over Washington’s push to include crops in a new trade agreement.