What is really missing in commercial aircraft is a Ford Tri-motor in any scale. I think 1:72 is the ideal scale for a plane that size. The Revell kit is 1:77, a weird scale that precludes replacing the poorly detailed kit engines with resin ones, or the Airfix 1:72 which is almost unbuildable- the struts do not position the nacelles correctly, and that plane has such a complex set of nacelle struts/lg struts that correcting them is extremely difficult.