Cabin crew told me that there are always more wheelchairs on flights going to and from India and others carrying large amounts of Indians (think Toronto to London to take a connecting flight from London to India) than other flights. It’s because Indians like the extra service and attention it gives them. It’s a product of Indian culture and the caste system. Indian flights are notoriously challenging for Western cabin crew (or indeed any non-Indian crew) because the customers are so demanding and, frankly, treat the staff terribly. Other flights to completely unrelated destinations are routinely delayed due to Indians occupying all of the wheelchairs at airports. If there is no wheelchair available for a genuinely disabled person when their flight arrives, it delays the unloading of that flight and makes that plane’s next journey delayed as well. Basically, Indian culture is causing severe delays around the world. As India becomes wealthier and more Indians can afford to travel, this problem is only going to get worse unless airports start refusing to let non-disabled people use wheelchairs.