New Delhi, March 31 -- With air passenger growth rising year after year in India, the airports business should have attracted investors by the hordes. But on the contrary, investors have been fleeing. Shares of GMR Infrastructure Ltd and GVK Power and Infrastructure Ltd, who hold large stakes in Indian airports, have fallen 57% and 65%, respectively, in the past 10 years, compared to a 328% rise in the Nifty 500 during the same period....