One asks what is the motivation behind crewless whatever form of transport. Mass transport short journey trains, e.g. STN terminal to stands, Hong Kong airport transport system etc. Cost saving and drivers deemed unnecessary. Safety improvements not really an issue. Driverless cars? No idea really. Aircraft, IMHO, is purely cost saving driven. There is no real increase in safety for the customer. It is the CEO's, who want to boost profits and all the consequential personal benefits that might be interested. However, if they had to fund the technological development and risks involved I doubt they'd be so enthusiastic. And the first airline that has a pilotless crash will collapse & sink faster than the Titanic.