Since the law was announced, the outcry against it has died down somewhat. Now, more than 1200 airlines (the vast majority of them) have chosen to comply with the law and have caused no further problems. India and China, however, have a number of airlines that are refusing to give their carbon emissions reports to the EU body in charge of monitoring the planes. Of the resistant airlines, 8 are Chinese and 2 are Indian. These offenders could be fined, or in worst case scenarios, banned completely from all airports within the EU.
The main argument against the law is that it involves a tax that effectively crosses international boundaries and affects people outside of its jurisdiction. Twenty nations were against the law when it was first announced and their original intent had been to retaliate in some way, such as levying their own special taxes against the EU. So far, nothing of the sort has happened, however.
As it stands now, the offending airlines have until mid-June to provide the information on their emissions. This will create the possibility of them being fined, though the only other choice is a potential ban. In addition, the EU is looking at alternatives to the law by working with the ICAO to come up with a plan that can be agreed upon at an international level. It is unfortunate that the quest to lower pollution levels in the world is met with such resistance. Once again, money is seen as more important than taking the necessary steps to ensure that the planet stays clean enough to support future generations of life.