Okay, how about costs for CIRs? The technology exists, but none of the manufacturing experts would commit to a definite figure. At the NTSB hearing, depending upon the airplane application and the type of CIR unit, the only numbers mentioned were in the range of $3,000 to $10,000. And those numbers were only for the CIR unit. The manufacturers all agreed that a good portion of the cost would be in the installation and the retrofitting. Multiply those seemingly benign numbers times an entire airline fleet.