Aviation and ATC Terminology — AAI ATC GK Lesson

Before you start

Learning objectives and outcomes

Objective 1Spell out AAI, ICAO, DGCA and IATA correctly and know how each differs.

Objective 2Know the IATA and ICAO codes for India's major airports.

Objective 3Define the seven core operational abbreviations: METAR, NOTAM, VOR, ILS, SSR, ADS-B, TCAS.

Outcome ATreat this chapter as close to guaranteed points, since it's unique to this exam.

Subtopic 1

The three regulatory bodies, once more

This chapter revisits AAI, ICAO and DGCA specifically as GK abbreviations and facts, alongside IATA, the global airline trade body that hasn't come up in earlier chapters.

Four bodies, four abbreviations

AAI — Airports Authority of India, formed 1995, HQ New Delhi
ICAO — International Civil Aviation Organization, HQ Montreal
DGCA — Directorate General of Civil Aviation, India's regulator
IATA — International Air Transport Association, global airline trade body

IATA is easy to confuse with ICAO since both start with "I" and relate to international aviation — ICAO sets safety and operational standards for governments, while IATA is a trade association representing airlines commercially.

✈ AAI ATC relevance — spelling out these four abbreviations correctly, without swapping ICAO and IATA, is tested directly and often

Memory trick — "ICAO is government, IATA is airlines"

ICAO is a United Nations agency working with governments on safety standards. IATA is a trade body representing the airlines themselves commercially — different membership, different purpose.

Easy

IATA stands for:

IATA stands for International Air Transport Association, a global trade body for airlines.

Moderate

Which organisation is responsible for setting international standards and recommended practices for civil aviation?

ICAO sets the international Standards and Recommended Practices (SARPs) that member states work to implement, distinct from IATA's role as an airline trade body.

Subtopic 2

Airport codes

Every airport has two different codes: a three-letter IATA code used on tickets and baggage tags, and a four-letter ICAO location indicator used in flight planning and air traffic control.

Codes for India's busiest airports

Delhi — IATA: DEL · ICAO: VIDP
Mumbai — IATA: BOM · ICAO: VABB

Every Indian airport's ICAO location indicator begins with the letter V — a quick way to confirm you're looking at an Indian airport's code rather than a foreign one.

Figure 2.1 — IATA vs ICAO code, side by side A simple two-column comparison: an airport name on the left, its three-letter IATA code and four-letter ICAO code (starting with V) on the right. Upload image here

Memory trick — "BOM for Bombay, not Mumbai"

Mumbai's IATA code, BOM, still reflects the city's former name, Bombay — a reminder that IATA codes are often historical rather than tied to a city's current name.

Moderate

The IATA airport code for Mumbai's Chhatrapati Shivaji Maharaj International Airport is:

The IATA code for Mumbai's airport is BOM, retained from the city's former name, Bombay.

Hard

The first letter of an Indian ICAO airport location indicator is generally:

Indian airport ICAO location indicators generally begin with the letter V, as in VIDP for Delhi or VABB for Mumbai.

Subtopic 3 · highest yield

Operational abbreviations

A cluster of operational abbreviations — covering weather reporting, notices, navigation aids and collision avoidance — forms the most exam-specific part of this whole GK syllabus, since it applies uniquely to this exam.

Core operational abbreviations

METAR — routine aerodrome weather report · NOTAM — Notice to Airmen
VOR — radio navigation aid · ILS — precision approach and landing aid
SSR — Secondary Surveillance Radar · ADS-B — Automatic Dependent Surveillance-Broadcast
TCAS — airborne collision avoidance

These seven abbreviations cover the full lifecycle of a flight's safety systems: weather awareness (METAR), advance notice of hazards (NOTAM), navigation (VOR, ILS), and surveillance/collision avoidance (SSR, ADS-B, TCAS).

✈ AAI ATC relevance — these seven operational abbreviations are unique to this exam and don't overlap with any other GK topic, making them pure, guaranteed points once memorised

Memory trick — "Weather, warning, guide, watch"

Group them by function: METAR is weather, NOTAM is a warning notice, VOR and ILS guide the aircraft, and SSR/ADS-B/TCAS all watch for other traffic.

Moderate

METAR is primarily a report of:

METAR (Meteorological Aerodrome Report) is a routine weather observation report issued at an airport.

Hard

TCAS is designed primarily to:

TCAS (Traffic Collision Avoidance System) monitors nearby aircraft and alerts pilots to potential collision risks.

Exam strategy

Facts worth having automatic

Four bodiesAAI (infrastructure), ICAO (global standards), DGCA (India's regulator), IATA (airline trade body).

ICAO vs IATAICAO works with governments; IATA represents airlines commercially.

Indian ICAO codesAlways start with V — VIDP (Delhi), VABB (Mumbai).

BOM = BombayMumbai's IATA code still reflects its former name.

Seven operational termsMETAR, NOTAM, VOR, ILS, SSR, ADS-B, TCAS — unique to this exam, guaranteed points.

Quick revision

Chapter summary sheet

AAIAirports Authority of India, formed 1995.

ICAOInternational Civil Aviation Organization, HQ Montreal.

DGCADirectorate General of Civil Aviation, India's regulator.

IATAInternational Air Transport Association, airline trade body.

Delhi codesIATA: DEL, ICAO: VIDP.

Mumbai codesIATA: BOM, ICAO: VABB.

METARRoutine aerodrome weather report.

NOTAMNotice to Airmen.

VOR / ILSNavigation aid / precision landing aid.

SSR / ADS-B / TCASSurveillance and collision avoidance systems.

↓ Free download — Aviation and ATC Terminology question PDF

All 6 questions with a full answer key.

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End of chapter

Comprehensive assessment

Full solutions are in the downloadable PDF above.

Multiple choice questions

1. What does IATA stand for, and how does its role differ from ICAO's?

2. What is the IATA code for Delhi's international airport?

3. What is the ICAO location indicator for Delhi's airport?

4. What letter do all Indian ICAO airport codes begin with?

5. What does METAR report?

6. What does NOTAM stand for?

7. What is VOR used for?

8. What is ILS used to assist aircraft with?

9. What does SSR stand for?

10. What is the primary purpose of TCAS?

Learning objectives and outcomes

The three regulatory bodies, once more

Four bodies, four abbreviations

Airport codes

Codes for India's busiest airports

Operational abbreviations

Core operational abbreviations

Facts worth having automatic

Chapter summary sheet

↓ Free download — Aviation and ATC Terminology question PDF

Comprehensive assessment

Multiple choice questions

Aviation and ATC Terminology — one more topic locked in.