Gassing up the C-17 cargo plane with a coal-based synthetic fuel could begin soon, according to an Air Force representative.

FORBES: Coal's Many Friends

"We have not seen any impact from the news from North Korea thus far, but we'll have to see about any further impact, " a Korean Air public relations representative told CNN.

CNN: Don't be afraid, Seoul's message to tourists

"We're working together to make sure safety is not going to be affected, but unfortunately, you might want to buy 'War and Peace' before you get on your next flight, " said Miami controller Jim Marinitti, a representative of the National Air-Traffic Controllers Association, the union representing all FAA controllers.

WSJ: Airlines Dispute Planned Air-Controller Cuts