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NERL
NATS En Route Ltd
NSL
NATS Services Ltd
LACC
London Area Control Centre
LTCC
London Terminal Control Centre
ScACC
Scottish Area Control Centre
OACC
Oceanic Area Control Centre
VHF Radio
Very High Frequency Radio
HF Radio
High Frequency Radio
VFR
Visual Flight Rules
IFR
Instrument Flight Rules
FL
Flight Level
ATZs
Aerodrome Traffic Zones
CTAs
Control Areas
UARs
Upper Air Routes
RVSM
Reduced Vertical Separation Minima
MTCD
Medium Term Conflict Detection
TBS
Time Based Separation
ANSP
Air Navigation Service Provider
VOR
VHF Omni-directional Range
DME
Distance Measuring Equipment
NDB
Non-Directional Beacon
FMS
Flight Management System
ICAO
International Civil Aviation Organisation
ILS
Instrument Landing System
TCAs
Terminal control areas
CAA
Civil Aviation Authority
EC
European Commission
HAL
Heathrow Airport Holdings Ltd