1,700 Private Jets Descend on Davos Economic Forum

Look to the skies this week in Switzerland and you'll see the heavens are cluttered with private jets.

Billionaires and world leaders from across the globe are flying en masse to the annual World Economic Forum in Davos, Switzerland -- and they insist on traveling in style.

Roughly 1,700 private flights are expected over the course of the week, which is twice as many as normal, according to WINGX Advance, a tracking firm. Traffic is expected to rise 5% compared to last year's event.

Private jet companies have warned clients to plan ahead, as securing spots for landing, take-off and parking can become a logistical nightmare.

"Because last year was so busy, private jet customers know ... that they have to book in advance," said Adam Twidell, CEO of the online jet booking company, PrivateFly. His firm helped clients secure about 20 flights for the event, which starts Wednesday.

These Swiss airports see the most private jet traffic during the World Economic Forum, according to WINGX Advance.