Accompanying this are a modified rear fuselage fairing, as well as a glass cockpit and uprated (from 3,700 to 4,300 lb thrust) Garrett TFE731-5R-1H engines.

The 850XP is identical to the 800XP except that it includes winglets, which have extended its operating range by 100 nautical miles (190 km).

[4] The Hawker 800 was similar to most modern airframes in requiring sub-assemblies to be constructed away from the final point of manufacture.

The fuselage sections, wings and control surfaces were manufactured and assembled in the United Kingdom in a combination of Hawker Beechcraft's own facility and those owned by Airbus UK, which inherited much of BAE Systems's civil aircraft manufacturing capacity.

These sections are partially fitted out and installed with control surfacing and major systems before being shipped to Hawker Beechcraft's main manufacturing site in Wichita, Kansas for final assembly, fitting out and testing.

[5] A military version of the Hawker 800XP is in use by South Korea for tactical aerial reconnaissance, surveillance and SIGINT (SIGnals INTelligence) tasks, and 8 specially equipped aircraft were delivered in 2000.

[6] With 48 built, this lower-cost, lighter-weight and shorter-range version of the 800XP competes with the Citation XLS and Learjet 60.

Its larger 604 cu ft (17.1 m3) cabin is typically configured with eight seats in double club or a four chair club followed by a three-place divan facing a single seat, and is pressurized by 8.5 psi (0.59 bar) to provide a 7,500 ft (2,300 m) cabin altitude at FL 410.

Its 4,750 lbf (21.1 kN) Honeywell TFE731-5BR have 2,100 h MPI and 4,200 h CZI inspection intervals, extendable to 2,500 h / 5,000 h with optional service bulletins, and MSP per engine.