Will there be a wise-cracking robot maid?

Your minicab has landed. Sky taxi's are nearly here - and it won't be that expensive.

Some interesting notes:

• Nasa's aim has been to try to get costs down to $2 per aircraft mile - still higher than the average $1 cost of a business class fare, but if an air taxi can save a roving executive time, that surplus cost quickly starts to disappear. And if two people fly, the figure immediately halves.
• ...But the price tag is most unlike a big passenger jet - just $1.3m per plane, a relatively reasonable sum in the industry.
• By using stripped-down airfields that are conveniently close by, air taxis would save 50% of time on an average journey...