The Immigration Authority (DNM) repeatedly imposes substantial fines on carriers. Despite the fact that in many cases these fines have been wrongly imposed, airlines must pay any outstanding fines in order to file a judicial complaint against the DNM, so the fines are widely viewed as another cost of operating in Argentina. That said, a number of airlines have recently challenged the DNM's fines and the courts have given a clear sign that, even with the above difficulties, it is worth challenging this legal loophole.