Creative maneuvering:

The trick would seem to be avoiding U.S. airspace or the airspace of nations friendly to the United States.

Snowden, a former National Security Agency contractor who faces espionage charges, would be wise to take a chartered jet on a route that goes over water the entire time, former CIA analyst Allen Thomson told Foreign Policy.

"Leave Moscow," he told the Foreign Policy. "Fly north to the Barents Sea, thence over to and through the Denmark Strait. Continue south, steering clear of Newfoundland until getting to the east of the Windward Islands. Fly through some convenient gap between islands and continue on to Caracas."

Kirk Koenig, president of Expert Aviation Consulting, told CNN that such a route would probably work, as it avoids the airspace of any countries that may try to ground the plane.

"That would probably be his only choice," he said.

Such a flight would not come cheap -- about $200,000 -- Koenig said.

"Where it gets more interesting is if they try to put him on an Aeroflot Russian Airlines flight nonstop to Havana, Cuba," he said. "The smart move would be to put him there as a passenger and hope nobody notices."

Would other countries make a commercial passenger jet land if they believe Snowden is on board? Given what happened to Bolivian President Evo Morales, it's possible, Koenig said.