[tijl]

But that's exactly what hguant explains. Flights between EU countries are international flights and are therefore tax exempt under the Chicago Convention.

[aembleton]

> barring a specific agreement between those two nations.

If every country in the EU agreed that every other country in the EU could impose tariffs on flights between them, then this should work.

[simonh]

hguant also pointed out:

>barring a specific agreement between those to nations

An EU wide agreement would be an agreement between nations.