Cessna Citation CJ4

Updated: October 2026 – A slim white jet sits on the general aviation apron: T-tail, two engines on the rear fuselage, at first glance a typical Citation. But the wings do not stick straight out from the fuselage; they are clearly swept back. Then you are very likely looking at a Cessna Citation CJ4, the largest member of the CitationJet family. Here you will learn how the CJ4 came about, which generations exist and how to reliably tell it from the CJ3, Phenom 300 and other light jets.

What is the Cessna Citation CJ4?

Internally the CJ4 carries the designation Model 525C and is the provisional end of a long line of development. In 1989 Cessna unveiled the original CitationJet (Model 525), which first flew in 1991. CJ1, CJ2 and CJ3 followed one after another – each time a bit longer, heavier and more capable. The CJ4 continues this path but goes a big step further: it got not just a stretched fuselage and more powerful engines, but a completely different wing.

The CJ4 was announced in October 2006 at the trade show of the US business aviation association NBAA. The first flight took place on May 5, 2008 in Wichita, and the first aircraft went to customers in 2010. In April 2023 Cessna delivered the 400th CJ4. The manufacturer today is Textron Aviation, under whose roof Cessna continues as a brand.

The wing comes from the larger Citation Sovereign and is swept by 12.5 degrees. That sets the CJ4 fundamentally apart from its smaller siblings, which all fly with a straight wing. It is powered by two Williams FJ44-4A engines with a good 16 kN of thrust each. According to the current data sheet it reaches a cruise speed of up to 451 knots, climbs to as high as 45,000 feet and covers about 2,165 nautical miles – how far it actually goes in everyday use depends on payload and weather.

According to the manufacturer, the cabin measures about 5.28 meters in length, 1.47 meters in width and 1.45 meters in height. An adult cannot stand up in it, but for a light jet that is generous. Important for operators: the CJ4 is certified for operation with just one pilot, which makes it interesting for owners who fly themselves.

The generations: CJ4, Gen2 and Gen3

From the outside the first two generations look almost the same; the differences are mainly in the interior and cockpit. With the third generation that changes.

Version	Period	Key new features
CJ4	deliveries from 2010	Stretched fuselage, swept wing, FJ44-4A engines
CJ4 Gen2	in service since 2021	Revised cabin and avionics updates
CJ4 Gen3	unveiled in October 2024, in flight testing as of fall 2026	Garmin G3000 PRIME, autothrottles, Garmin Emergency Autoland, new winglets with accent lighting

Textron unveiled the Gen3 on October 21, 2024 at NBAA-BACE in Las Vegas. The centerpiece is the Garmin G3000 PRIME cockpit, along with automatic thrust control and the emergency landing system Emergency Autoland, which in an emergency guides the aircraft on its own to a suitable airport and brings it to a stop there. In July 2026 Textron reported more than 880 hours of test flying with two test aircraft, including tests for winglet certification. At the end of September 2026 flight testing was still under way; Textron expected FAA certification during 2026. Whether and when the first Gen3s will actually be delivered is something you should check for current information.

The three features that are enough to identify it

With business jets, identifying the type is often trickier than with airliners, because many models share the same basic layout. For the CJ4, three observations help you.

In the end the registration confirms the type. You use it to look the aircraft up in registry databases and also see whether it is a Gen2 or Gen3. How registrations are structured is explained in the post Understanding aircraft registrations.

CJ4 or CJ3?

The most common mix-up happens within the family itself. The Citation CJ3 is the direct predecessor and often stands on the same apron.

Feature	CJ4	CJ3
Official designation	Model 525C	Model 525B
ICAO type designator	C25C	C25B
Wing	12.5° swept	straight (0°)
Length	16.26 m	15.59 m
Wingspan	about 15.5 m (Gen3 with winglets 15.77 m)	16.26 m
Engines	2 × FJ44-4A, about 16.1 kN each	2 × FJ44-3A, about 12.5 kN each
Cabin length	5.28 m	4.78 m

Remarkable: the smaller CJ3 has the larger wingspan. The CJ3’s straight wing is designed wide, while the CJ4 flies faster with a shorter but swept wing. Once you have seen the two side by side, you can tell the difference even at a distance. The CJ1 and CJ2 are much smaller and also fly with a straight wing – just like the entry-level Citation Mustang, which, however, does not belong to the Model 525 family.

CJ4, Phenom 300 or PC-24?

Outside the Cessna family there are two light jets you should keep an eye on. The finder helps you narrow it down.

The Embraer Phenom 300 is the direct competitor and is also widespread in Europe. The Swiss Pilatus PC-24 plays in the same size class but has a distinctive look of its own, including a large cargo door at the rear left. You can get an overview of the main business jet families in the guide Telling business jet types apart. Which code belongs to which type is explained in the article on ICAO type codes.

Where to find the CJ4

The CJ4 is not an airliner with a fixed schedule. It flies for owners, companies and charter providers – and goes wherever the customers want to go. That makes it exciting, but also harder to plan for.

Location	Chance of a catch	Why
Geneva	high	One of Europe’s most important business aviation airports, especially during trade fairs and conferences
Zurich	medium to high	Lots of business travel traffic, its own GA apron
Salzburg	medium, seasonal	Ski traffic in winter, festival season in summer
Nice and the Côte d’Azur	high in summer	Heavy private jet traffic in season
Smaller regional airports	medium	The CJ4 manages with comparatively short runways

At Geneva Airport, from the observation deck you have good chances of business jets of all sizes; what makes the place special is covered in the Geneva plane spotting guide. In Zurich the Butzenbüel is worth it for takeoffs and landings at Zurich Airport. Salzburg Airport is a classic for business jet fans on winter weekends; from the observation deck you have a good view of the apron. In summer, Nice Airport is worth a visit.

How to follow individual aircraft specifically is explained in the post Tracking an aircraft by registration. You will find general tips for hunting private jets in Spotting business jets and Spotting general aviation.

Spotting at the GA apron: how to plan your session

Business jets usually park on separate aprons, often away from the big terminals. For good pictures you therefore need either a vantage point with a view of that apron or a spot on the approach path. Because the CJ4 is small, you should plan for more focal length than for airliners: what fills the frame with an A320 makes a 16-meter aircraft look lost in the picture.

Whether your vantage point is legally unproblematic is covered in the article Is plane spotting allowed?. Which lenses suit small aircraft is in the guide to the right focal length.

Photo tips specifically for the CJ4

You can calculate in advance when the light works at your spot with the guide Planning the sun position for your photo spot. How rare your CJ4 sighting is compared with other types you can judge with the post Judging the rarity of a sighting.

Common lookalikes and how to rule them out

Conclusion

The Citation CJ4 is the point where the CitationJet family grows up: the same basic layout with a T-tail and rear-mounted engines, but with a swept wing, a longer fuselage and much more power. For spotters, that very wing is the ticket to a reliable identification. With the Gen3 and its winglets, telling it from the Phenom 300 does get a little trickier, but the type code and registration resolve any doubt.