Air traffic headed to the UK often experiences delays that call for holding patterns, a maneuver seldom used in the U.S. A new video from NATS, the UK’s air navigation service provider, offers an interesting perspective on some 7,000 flights during the course of a single day, an aerial tour of sorts of the busy UK airspace. The video includes the military training zones near Wales and the busy helicopter bases that serve the North Sea oil and gas rigs.