"Flight feathers" refers to the specialized feathers on a bird's wings and tail that help it fly and maintain balance while in the air. Full definition
As soon as you notice the tips of new flight feathers showing, start thinking about a new trim. (parrotparrot.com)
How many flight feathers to take off and the length depends greatly on the age and species of parrot. (petbusiness.com)
More flight feathers, approximately seven to nine, need to be trimmed on birds with long, pointed wings, while six to seven is enough on those with rounded ones. (petbusiness.com)