ALPHAAAE: Above Aerodrome Elevation
BACKTRACK: To taxi on the active runway in the direction opposite to landing aircraft, usually to position the aircraft for takeoff at an airport with no taxiways.
BASE: The part of the landing traffic pattern where the plane flies at a 90 degree angle to that of the landing runway.
BEARING: The horizontal direction to or from any point, usually measured clockwise from true north. Magnetic north or a reference point through 360'.
BRAKING ACTION REPORT: A report of conditions at the airport movement area providing information to a pilot about the degree of braking quality that can be expected (good, fair, poor, nil)
CAVOK: Ceiling and Visibility OK, visibility is 10km or more, no clouds under 5000Ft (or highest minimum sector altitude) no fog or mist, and no precipitation, thunderstorm or drifting snow.