I looked up the distance from Bucharest to Rome it's 700 miles. The same distance as Minneapolis to Denver. The cheapest price I found quickly booking 2 months

I looked up the distance from Bucharest to Rome it's 700 miles. The same distance as Minneapolis to Denver. The cheapest price I found quickly booking 2 months in advance was $34 (eu) and $90 (us) respectfully. Interesting price difference. It seems after a little bit of research this has to do with reduced demand for air travel in the us. But if it were to be something the eu has done, which largely generally surrounds higher regulation and the suppression of competition. How has it done so?