Preheat the oven to 325℉. Grease and flour three 8x2 inch round pans.
In a medium bowl, whisk the flour, baking powder and salt for 30 seconds. Set aside.
In another bowl, add the ¾ cup orange juice concentrate, vegetable oil, milk and orange extract. Set aside.
In the bowl of your mixer, add the butter and mix at medium speed until smooth. Gradually add the sugar and mix for 3 to 5 minutes until lightened in color and fluffy.
Add the eggs one at a time, mixing after each until the yellow of the yolk has blended.
With the mixer on low speed, alternately add the flour mixture and the orange juice mixture, beginning and ending with the dry ingredients. (That will be three additions of dry and two of liquid).
Divide the orange cake batter between the three prepared 8 inch cake pans.
Bake at 325 degrees for 25 to 28 minutes or until a toothpick inserted into the center comes out clean or with just a few crumbs attached. Let cool 5 to 10 minutes and turn out.