Some flights have been delayed, but any losses there can be made up by extra revenue generated by diverted flights that refuel in Mumbai. Keep in mind that flights from Mumbai, India's largest airport, do not even need to fly over Pakistan to get to the Middle East and Europe. It is really only northern India that has been the most affected. Also flights to East an SE Asia and Australia are not affected. But yes, there really is no good way to circumnavigate Pakistan to get to Central Asia, India has been hurt there. But as I said, Central Asia is only a small market for India's commercial airline industry, so extra flight hours to Central Asia will not harm India's airline industry.