But more likely it's because I believe that it results in a happier, healthier animal. Birds were meant to fly. Mother nature gave them wings so that they may become airborne. I believe that all wing clipped captive birds and especially young birds should periodically be permitted to realize confident flight even though in most cases they will not be able to realize the gift of flight as fully as their wild flock mates. Young captive birds that are permitted to become confident fliers before they are clipped will be more confident adults if and when they are clipped.
Flight is one part of movement that helps a bird maintain it's balance.
A young wing clipped bird never permitted to attain confident flight will have neither the robust health, balance nor the confidence that a flight trained bird will have. Some varieties of birds should never have their wing feathers clipped. Softbills including finches, waxbills and others need their wings for balance and flight and should never have their wing feathers clipped. If you decide to flight train your pet bird you must proceed with caution because there are many hazards. You will need to carefully bird proof your environment and take a safety first approach to training, just like they do at the airport.