b..
Used to describe the point where two runways, a runway and a taxiway, or two taxiways cross or meet.

INTERSECTION DEPARTURE- A departure from any runway intersection except the end of the runway.
(See INTERSECTION.)
INTERSECTION TAKEOFF-
(See INTERSECTION DEPARTURE.)
IR-
(See IFR MILITARY TRAINING ROUTES.)

J

JAMMING- Electronic or mechanical interference which may disrupt the display of aircraft on radar or the transmission/reception of radio communications/ navigation.
JET BLAST-Jet engine exhaust (thrust stream turbulence).
(See WAKE TURBULENCE.)
JET ROUTE- A route designed to serve aircraft operations from 18,000 feet MSL up to and including flight level 450. The routes are referred to as “J” routes with numbering to identify the designated route; e.g., J105.
(See Class A AIRSPACE.)
(Refer to 14 CFR Part 71.)

JET STREAM- A migrating stream of high‐speed winds present at high altitudes.
JETTISONING OF EXTERNAL STORES- Air-borne release of external stores; e.g., tiptanks, ordnance.
(See FUEL DUMPING.)
(Refer to 14 CFR Part 91.)

JOINT USE RESTRICTED AREA-
(See RESTRICTED AREA.)

K

KNOWN TRAFFIC- With respect to ATC clear-ances, means aircraft whose altitude, position, and intentions are known to ATC.

L

LAA-
(See LOCAL AIRPORT ADVISORY.)
LAAS-
(See LOW ALTITUDE ALERT SYSTEM.)
LAHSO- An acronym for “Land and Hold Short Operation.” These operations include landing and holding short of an intersecting runway, a taxiway, a predetermined point, or an approach/departure flightpath.
LAHSO‐DRY- Land and hold short operations on runways that are dry.
LAHSO‐WET- Land and hold short operations on runways that are wet (but not contaminated).
LAND AND HOLD SHORT OPERATIONS-Operations which include simultaneous takeoffs and landings and/or simultaneous landings when a landing aircraft is able and is instructed by the controller to hold‐short of the intersecting runway/ taxiway or designated hold‐short point. Pilots are expected to promptly inform the controller if the hold short clearance cannot be accepted.
(See PARALLEL RUNWAYS.)
(Refer to AIM.)
LANDING AREA- Any locality either on land, water, or structures, including airports/heliports and intermediate landing fields, which is used, or intended to be used, for the landing and takeoff of aircraft whether or not facilities are provided for the shelter, servicing, or for receiving or discharging passengers or cargo.
(See ICAO term LANDING AREA.)
LANDING AREA [ICAO]- That part of a movement area intended for the landing or take‐off of aircraft.