'Proximity error'

Between 5:45 and 5:47 p.m. on June 6, a small Cessna jet "crossed the course" of a Boeing 777 bound for Germany, violating the required separation of 1,000 feet in altitude and three miles in distance. The FAA acknowledged the mistake, but downgraded the incident from an "operational error" to a less serious "proximity error."

© 2010 The Washington Post Company