One might be especially fascinated by the airliner design, as the sesquiplane plane structural box was strong, tried and true, and allowed a good place to mount the (more efficient) double propeller.
The Caproni CA.73 airliner could lift 2 tons and fly at around 100 knots, well within the aerodynamic speed limitations of biplane designs, with 2 500 Horsepower engines.
The "inverted" sesquiplane very thoughtfully makes use of ground effect to assist in short/muddy field take offs.
Though many may scoff at biplane designs with more modern materials available, one can't help to notice that thinner wings are better in the high subsonic realm that many airliners operate in.
A proposed airliner design bears an uncanny resemblance to the (non-inverted) sesquiplane, which could allow for higher aspect wings with adequate strength.
