"After 2000 all EU airlines can operate flights within the EU as if it was one country."
I know as I am an industry professional. And it started in 1993, b.t.w.
I ask why it works in S1 world and why it idoesn't work in my R3 world then....
It won't work until the in-game date reaches 1st January 2000. The in-game date in S1 is December 2003, and the current in-game date in R3 is December 1984, that's why it's only working in S1.