Changes in the Earth's core are responsible for the roving north pole, forcing the runway to change its designation on aviation charts from 18R/36L to 19R/1L. (www2.tbo.com) 更多...
When I was an engineering intern at Pan Am shortly after the introduction of the 747, there was an accident at SFO involving Clipper America. This is a grainy but fascinating video about the accident. (www.youtube.com) 更多...