Preheat the oven to 300 degrees.
Place the egg whites in a large mixing bowl along with the cream of tartar and kosher salt. Beat the egg whites on medium speed until foamy, about 45 seconds.
Gradually add the sugar, about a tablespoon at a time, beating into the egg whites after each addition.
Continue beating until the egg whites are glossy and stiff peaks stand, about 2 minutes. The egg whites need to be very stiff to hold their shape.
Using a large rubber spatula, fold in the almond extract and the flaked coconut.
Scoop 1” rounds of batter onto a Silpat lined baking sheet, leaving about 2” between each macaroon.
Bake in a 300 degree oven for 20 to 25 minutes or until the edges and tops of the macaroons are lightly golden.
Let the macaroons cool on the pan for about 10 minutes, then gently remove and transfer to a wire rack to cool completely.