1.   A. In an October appearance in Atlanta Traffic Court, Julie Pound pleaded guilty to charges of failure to comply with traffic instructions and disorderly conduct.

2.   Plows had buried illuminated taxiway signs, making it difficult for pilots unfamiliar with the airport to follow air traffic control instructions.

3.   The National Transportation Safety Board said it was investigating the incident on Monday to reconstruct the traffic instructions issued by controllers to the two planes.

4.   These include following air traffic control instructions, flying above minimum altitudes, maintaining safe distance from other aircraft and having navigational equipment.

5.   Julie Pound pleaded guilty last week to charges of failure to comply with traffic instructions and disorderly conduct, according to her lawyer, Jim Martin.

6.   At one point police helicopters rigged with powerful public address speakers swooped low over traffic barking instructions to motorists to steer clear of the area.

7.   Pilots at some low-cost airlines were reported on Tuesday to have put passengers at risk by disobeying air traffic control instructions.