I am seriously thinking that airline companies and travel agencies/webservices in the USA practice collusion (price fixing).

There are no price differences whether you check at Travelocity, hotwire, cheaptickets etc. etc. They normally run within $20 of each other. The same applies for hotel/flight combos, there may be a $50 difference but that's about it.

I am from Holland

and when I check my separate travel sites there, there are real deals with sometimes hundreds of $ differences between agencies/websites.

Here in the USA I can never seem to get a real good deal, it makes no difference which site you use. In Europe there's an avid watch from the government for this type of collusion and businesses that are caught get fined huge (millions).

What's your thinking on this?