A New York Times article from August 29, 2006 posed the question, "Will having a lavatory on board be the key factor in short flight
success?"[12]
However, 600-700 is really just to fulfil the replacement market, says Raburn. "We have an impending airworthiness crisis in the general aviation
market. Many of them out there are 40- to 50-year-old aircraft built to Second World War standards. They were never designed to last this
long.