The Citation X has held a peculiar position in business aviation since its 1996 introduction. The original X was the fastest civilian aircraft in service for over two decades, holding that title through the Citation X+ variant introduction and through the 2018 production end. The Bombardier Global 8000 has now claimed the absolute speed crown at Mach 0.94, but the X+ remains the fastest super-midsize in service and the second-fastest civilian aircraft overall.
From this desk, the X+ is a study in legacy aircraft viability. Production ended in 2018 — eight years ago as of mid-2026. The type’s long-run value depends on three things continuing: Textron Aviation’s factory support, Honeywell’s engine support, and a parts supply chain that remains economic to maintain. All three are intact in 2026. The X+ pre-owned market reflects that intact support pipeline.
The speed differentiator and what it actually delivers
The X+ is certified for a maximum operating Mach number of 0.935. In practice, most X+ revenue operations cruise in the Mach 0.85-0.90 range — the Mach 0.935 capability exists but is rarely used because of fuel burn and operational considerations. The speed advantage over typical super-midsize competitors is roughly 0.05 Mach in routine cruise, which translates to 30 to 60 minutes of block time savings on transcontinental flights and 60 to 90 minutes on transatlantic.
The block time advantage is the X+‘s structural value proposition. On a 5-hour flight, saving 30 minutes is meaningful but not transformative. On a 7-hour transatlantic flight, saving 60 minutes is genuinely valuable for high-utilization business travelers. The X+ has been particularly popular with executive teams that fly transatlantic regularly.
The Honeywell AS907-2B (also designated HTF7000) engines that enable the speed are derived from the broader HTF7000 family that also powers the Challenger 350/3500 and the Praetor 500/600. The engine support pipeline is therefore not unique to the X+ — Honeywell’s broader HTF7000 service network supports a large in-service fleet across multiple aircraft types. This is structurally good for X+ long-run support.
The cabin reality
The X+ cabin is smaller than newer super-midsize types. Cabin length of 25 feet 2 inches, width of 5 feet 6 inches, height of 5 feet 8 inches. The cross-section feels narrower than the Praetor 600 or Challenger 3500. The typical eight-passenger double-club layout is comfortable but tighter than the newer competitors.
For buyers who prioritize speed over cabin, this trade is acceptable. For buyers who fly with larger groups or who value the cabin experience above all else, the newer super-midsize types are better choices. The X+ is best understood as a speed-optimized aircraft rather than a comfort-optimized aircraft.
The Garmin G5000 flight deck on late-build X+ aircraft is the same architecture used on the Longitude and is well-supported. Earlier X+ aircraft (and original Citation X variants) may have older Honeywell Primus 2000 or Primus Epic avionics that are increasingly difficult to maintain — buyers evaluating pre-X+ original Citation X aircraft should pay particular attention to avionics status.
The pre-owned market reality
Pre-owned X+ inventory has been tight through 2026, consistent with the broader pre-owned business jet market tightness. Asking prices for late-build X+ aircraft from the 2014-2018 production window have held firm in the $14-$19 million range depending on hours, avionics, and maintenance status. Aircraft with low hours, current avionics, and clean maintenance histories command the upper end of that range with limited negotiation.
Earlier-production original Citation X aircraft (the pre-X+ variant, produced 1996-2012) trade significantly lower. Asking prices for original Citation X in the $4-$8 million range reflect the older airframe, the older avionics, and the more limited future service horizon. These aircraft can be excellent value propositions for buyers willing to accept legacy avionics and to plan for the type’s eventual retirement timing.
The X+ pre-owned transaction velocity has been steady. Aircraft list and sell within typical industry timelines. The market is neither distressed nor in unusual demand — it reflects the broader supply-constrained pre-owned environment.
Operating costs and economics
Direct operating costs for the X+ run roughly $4,500-$5,500 per hour depending on fuel pricing, utilization, and maintenance assumptions. The figure is comparable to other super-midsize types — the X+ does not have a meaningful operating cost advantage or disadvantage relative to the Praetor 600 or Challenger 3500.
The HTF7000-series engine support through Honeywell’s MSP (Maintenance Service Plan) is the standard option for engine maintenance budgeting. The plan converts unpredictable engine event costs into predictable hourly rates. For X+ operators, MSP enrollment is the operating standard.
Annual inspection cycles for the X+ follow the Cessna maintenance program with major events at typical intervals. Textron Aviation’s factory service center network handles the bulk of X+ maintenance work, though third-party MRO providers (Standard Aero, Dassault Falcon Service, others) also support the type.
The long-run viability question
The honest question about any post-production aircraft is how long the support pipeline will remain viable. For the X+, the answer is favorable through at least the next decade. Three factors support that view.
First, Textron Aviation continues to actively support the type. Factory service centers handle X+ work, parts supply chains are intact, and Textron has not indicated any planned reduction in support intensity. The type’s installed base of approximately 340 aircraft (Citation X + X+) is large enough to justify continued support investment.
Second, Honeywell continues to support the AS907-2B engines through MSP and through broader HTF7000-family service infrastructure. The engine fleet across multiple aircraft types provides scale economics for the support network.
Third, the Garmin G5000 avionics on late-build X+ aircraft are an active, supported architecture used across multiple Textron Citation models. Avionics obsolescence is not a near-term concern for late-build X+ airframes.
The risk factors are longer-horizon. By the mid-2030s, the X+ will be approaching 20 years post-production, the in-service fleet may have meaningfully reduced through retirements, and the economics of continued OEM support will be a Textron internal decision. Buyers planning multi-decade ownership should monitor support indicators through the late 2020s.
Buyer profile
The X+ buyer in 2026 is typically one of three profiles. The first is the speed-prioritizing executive — frequent transatlantic or coast-to-coast flyer who values 30-60 minutes of block time savings per flight. The second is the legacy Citation operator — a company or individual already operating other Citation types who values fleet consistency. The third is the value buyer — someone targeting the pre-X+ original Citation X for the lower acquisition cost while accepting the older airframe and avionics.
The X+ is not the right choice for buyers prioritizing cabin comfort, for buyers needing the latest flight deck technology, or for buyers planning multi-decade ownership with full support certainty. For the speed-prioritizing buyer, the X+ remains uniquely positioned with no current production equivalent in the super-midsize tier.
What I am watching through year-end 2026
Two indicators. First, Textron’s support investment posture — any 2026 announcement about X+ service center capacity, parts manufacturing investment, or avionics upgrade programs signals continued strong support commitment. Second, pre-owned transaction velocity through 2026 — sustained transaction pace at firm asking prices confirms the market views the type as a viable long-run asset.
My base case is continued strong support and stable pre-owned pricing through year-end 2026. The X+ remains a niche aircraft within the super-midsize tier — narrower buyer profile than the broader-market Praetor 600 or Longitude, but with a unique speed proposition that has no current production equivalent. For the right buyer, the X+ is still the right airplane.
Standing Questions
- When did Citation X+ production end?
- Cessna ended Citation X+ production in 2018. The type had been in continuous production from the original Citation X starting in 1996 through the X+ variant. Total production across both variants was approximately 340 aircraft.
- What is the Citation X+ maximum cruise speed?
- The Citation X+ is certified for a maximum operating Mach number of 0.935. That makes it the fastest civilian aircraft in service outside of the Bombardier Global 8000, which is rated to Mach 0.94. Maximum cruise speed in normal operations runs in the Mach 0.85-0.90 range; the Mach 0.935 capability is rarely used in revenue service.
- Is Textron still supporting the X+?
- Yes. Textron Aviation continues to support the Citation X+ through its factory service center network and OEM parts supply. Honeywell continues to support the AS907-2B engines (also designated HTF7000) that power the X+. The support pipeline through the next decade is intact.
- What does a pre-owned X+ cost in 2026?
- Pre-owned X+ pricing depends heavily on hours, avionics configuration, and maintenance status. Late-build X+ aircraft from the 2014-2018 production window with low hours and current avionics are trading in the $14-$19 million range. Earlier-production original Citation X aircraft (pre-X+) trade meaningfully lower, in the $4-$8 million range depending on condition.
- Should I buy an X+ versus a newer super-midsize?
- It depends on what you value. The X+ wins on speed — no other production super-midsize approaches Mach 0.935 capability. The X+ loses on cabin (smaller than Praetor 600 or Challenger 3500) and on flight deck (older Garmin G5000 architecture predates the most recent OEM cockpits). For buyers who prioritize the speed differential, the X+ is uniquely positioned. For buyers who prioritize cabin comfort, the newer types are better.
