You only have to look on any Airline Fare website to see that the carriers still collude with one another. Searching for a trip to Bangkok later in the year on various sites brought up four flights within a few pence of one another. And they all seem to end in .42 or .62 pence!
It is very similar with prices to the states. I don't think it is collusion, they just watch each others prices.
Otherwise you could say Petrol stations collude to set the price of fuel, and any other company that sells anything!!