Cart Shopping Cart My Store Account Orders Downloads Shopping Cart “23. The Value of a Pound” has been added to your cart. Continue Shopping “20. Wing Weight Estimating Simplified” has been added to your cart. Continue Shopping Remove item Thumbnail image Product Price Quantity Subtotal × 2. Airplane Weight and Balance Control $20.00 2. Airplane Weight and Balance Control quantity $20.00 × 23. The Value of a Pound $20.00 23. The Value of a Pound quantity $20.00 × 20. Wing Weight Estimating Simplified $20.00 20. Wing Weight Estimating Simplified quantity $20.00 Coupon: Apply coupon Update cart Available coupons (Click to apply). Cart totals Subtotal $60.00 Tax $0.00 Total $60.00 Proceed to checkout