Yes, that statement is true. Air transport is generally more expensive compared to other modes of transportation such as sea or road. Therefore, it is more cost-effective to use air shipment for products that have a high value relative to their weight. This is because the high cost of air freight can be justified by the higher value of the goods being transported. Examples of products with a high cost to weight ratio that are commonly shipped by air include electronics, pharmaceuticals, and perishable goods.