An EU bureaucrat if they found themselves on this site might conclude from some of the posts above that price fixing is considered perfectly normal. Indeed there is some suggestion that there is no other way of doing business.
However just because it has always been so does not mean that something is right. Making a ton of money on certain routes and using your position to control prices is exactly what the competition authorities are supposed to stop. Sending a message that this is unacceptable would seem to be absolutely right.
A big problem would seem to be that the airfreight industry has pretty fixed limits of capacity trying to cope with highly dynamic demand. Prices should fall when demand is lower and vice versa. However given certain important cost components, such as the price of jet fuel or navigation charges, being the same for all airlines, there are bound to be pricing similarities.
The issue would seem to be if there are wide discrepancies in apparent yield between similar routes for no obvious reason other than by inference price fixing. E.G. Europe/China having very different prices than Europe/Africa or Europe/America but remarkably consistent amongst all competitors.
Looking at it from the other direction it is interesting to note who is thriving and who is failing..... Jade cargo shutting up shop versus DHL introducing 18 A300s for instance.