The drag-reducing benefit of flying in formation has been known for decades—far longer if you are a bird—but making it practical is the challenge. Geese join up in V formations when they migrate, but all are headed in the same direction; finding opportunities for formation flying within military and commercial air-transport networks crisscrossing the globe is harder.

Does a different backdrop foretell a revival of defense deals in 2014?

Barely a decade ago, the U.S. Defense Advanced Research Projects Agency (Darpa) demonstrated that driverless vehicles could navigate desert roads and negotiate city streets. Now car manufacturers from Audi to Toyota are promising that autonomous driving technology will make their vehicles safer by the middle of this decade.

The past few months have seen stark harbingers of looming pain.

A&D companies and investors need to understand each other better

Not so fast, says Bombardier aircraft chief

The idea of recycling regional-jet winglets into bookshelves may raise a skeptical eyebrow, but manufacturers are talking seriously about how to manage the end-of-life for their aircraft and engines—however distant that may seem today.

While there is plenty to debate about where U.S. defense budgets could settle in 2014-15, there is no debate about the Pentagon's desire to continue to compete with cutting-edge technology. It expects defense advantages to be sustained through investment in new weapons and support systems that provide a generational lead over those fielded by adversaries.