How to Tell Aircraft Apart
How to Tell Aircraft Apart
When you are new to aviation, all aircraft can look alike. But with a few simple visual cues, you can quickly learn to distinguish one type from another. This lesson covers the fundamental features to look for when identifying aircraft at Prestwick or any other airport.
The Six Key Features
Aircraft identification comes down to observing six main features:
1. Wing position (high, mid, or low)
2. Engine count and position
3. Tail shape
4. Nose shape
5. Landing gear configuration
6. Overall size and proportions
Let us work through each one.
1. Wing Position
This is one of the quickest ways to narrow down an aircraft type.
- Low wing -- the wings attach at or near the bottom of the fuselage. Most commercial airliners have low wings, including the Boeing 737 (Ryanair's fleet) and the Boeing 777 (cargo visitors).
- High wing -- the wings attach at the top of the fuselage, above the cabin. Military transports like the C-17 Globemaster III and C-130 Hercules have high wings. So do many turboprop aircraft and some business jets like the BAe 146/Avro RJ.
- Mid wing -- rare on commercial types, but some military jets and fighters use this configuration.
Prestwick tip: If you see a large aircraft with high wings and four engines, it is very likely a C-17 or C-5. If it has high wings with four turboprops, think C-130 Hercules.
2. Engine Count and Position
How many engines does the aircraft have, and where are they?
| Configuration | Examples at Prestwick |
|---|---|
| Two engines under the wings | Boeing 737 (Ryanair), Boeing 767F, Boeing 777F |
| Two engines on the rear fuselage | Cessna Citation, Embraer Phenom (business jets) |
| Four engines under the wings | Boeing 747F (cargo), C-17 Globemaster III |
| Four engines (two on wings, two on rear) | Rare -- not common at Prestwick |
| Two turboprops on the wings | King Air, ATR types |
| Single turboprop on the nose | Pilatus PC-12 |
For most spotting at Prestwick, the majority of traffic will be twin-engine jets with engines under the wings (the 737 family). When you see something with four engines, pay attention -- it is likely something more unusual.
3. Tail Shape
The tail (empennage) varies between aircraft types:
- Conventional tail -- a vertical fin with horizontal stabilisers at the base. This is the most common arrangement. The Boeing 737 has a conventional tail.
- T-tail -- the horizontal stabiliser sits on top of the vertical fin, forming a T shape. The C-17 Globemaster III has a T-tail. So do many business jets (Citation, Embraer Phenom).
- Cruciform tail -- horizontal stabiliser partway up the vertical fin. Less common.
Prestwick tip: If you see a large grey aircraft with a T-tail and four engines, that is almost certainly a C-17.
4. Nose Shape
The shape of the aircraft's nose can help confirm an identification:
- Pointed nose -- most jet airliners and business jets have a sleek, pointed nose.
- Bulbous nose -- the Boeing 737 has a distinctive rounded, slightly blunt nose compared to other Boeing types.
- Radome nose -- military aircraft like the P-8A Poseidon have a pronounced radome (radar housing) under the nose.
- Upward-opening nose -- the Boeing 747F has a nose cargo door that swings up, which you might spot when it is open on the freight apron.
5. Landing Gear
Look at the landing gear when the aircraft is on approach or taxiing:
- Tricycle gear -- nose wheel plus two main gear assemblies. This is standard on nearly all modern aircraft.
- Number of wheels -- the 737 has two wheels on each main gear leg (four main wheels total). The 777 has six wheels on each main gear leg (twelve main wheels). The 747 has four main gear assemblies with four wheels each (sixteen main wheels). More wheels generally means a heavier aircraft.
- Gear position -- on the 737, the main gear retracts into the fuselage belly. On many military transports, the gear is bulkier and may have visible fairings.
Prestwick tip: If you see an aircraft on approach with a truly enormous number of wheels, it is a widebody -- possibly a 747 or 777 freighter on the cargo run.
6. Size and Proportions
With practice, you develop an instinct for size:
| Category | Wingspan | Length | Examples at Prestwick |
|---|---|---|---|
| Light aircraft | Under 15m | Under 12m | Training aircraft, Cessna 172 |
| Business jet | 15-25m | 12-25m | Citation, Phenom, Challenger |
| Narrowbody airliner | 28-36m | 30-45m | Boeing 737 (Ryanair) |
| Widebody airliner | 45-65m | 50-70m | Boeing 767F, 777F, 747F |
| Military heavy | 50-70m | 50-75m | C-17, C-5 Galaxy |
Putting It All Together
Here is a quick-reference decision tree for Prestwick:
1. Is it a single-aisle jet with two engines under low wings? Probably a Boeing 737 (Ryanair). Check the winglet style to determine the variant.
2. Is it a large aircraft with high wings and four jet engines? Military -- likely C-17 (T-tail) or C-5 (conventional tail, enormous).
3. Is it a large aircraft with high wings and four turboprops? C-130 Hercules.
4. Is it a widebody with two engines and low wings? Cargo -- possibly a 767F or 777F.
5. Is it a widebody with four engines and a distinctive hump? Boeing 747 freighter.
6. Is it small with engines on the rear fuselage? Business jet.
7. Is it a small propeller aircraft? Training flight or general aviation.
Tips for Beginners
- Bring binoculars. Even a modest pair will help you read registration markings and see details like winglet shape.
- Use a flight tracking app. Apps like Flightradar24 or ADS-B Exchange will show you exactly what aircraft are in the area and their type codes.
- Start with the common types. Learn the 737-800 silhouette first since you will see dozens of them. Then branch out.
- Look at the registration. Ryanair 737s carry Irish registrations starting with EI-. Military aircraft often have serial numbers in different formats.
- Note the time. Cargo traffic tends to operate early morning and late evening. Military traffic is unpredictable but often mid-week.
With these basics, you are ready to start identifying aircraft at Prestwick with confidence.