Today’s Emperors – Microsoft co-founder Paul Allen and Google co-founder Sergey Brin are building, respectively, the world’s biggest plane and the world’s biggest airship.

Allen’s twin fuselage, six-engine ‘Stratolaunch’ is 238 feet long, 50 feet tall with a wingspan of 385 feet. Here it is:

Brin is building the world’s biggest airship – over 200 foot long – at a cost of over $100 million. It’s described as an ‘air yacht’.

We’ve seen bonkers billionaires, mostly Russians, vying with eachother to build the world’s biggest yacht, so the Allen-Brin thing is an entertaining variation on the follies with which plutocrats beguile us.