The key task in development, in Mr Stern's opinion, is to open up the Quad's markets.

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Unlike its competitors, Stern said the independent watch maker has resisted the temptation to open up "massively" in China because he believed it would damage the company's integrity.

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It explores the idea of a low-fuel-use plane that uses open-rotor engines mounted on what is called a Pi-tail in the stern of the ship.

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For Ms. Stern and Ms. Sundberg, the challenge was getting the two pitchers to open up at times when it would have been easier for them not to.

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Interestingly, almost three-fifths of the attendees for the Stern course came from outside the U.S., indicating that businesses are ready to open the travel purse strings when a course offers the right content.

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