This 1977 Learjet 25D (N890MJ, serial 229) represents an exceptionally maintained example of first-generation corporate jet history, with only 4,900 total hours and engines showing just 60 hours since overhaul. The aircraft underwent a comprehensive 12-year inspection in 2018 and features a complete 2021 Universal Avionics EFIS 890R Synthetic Vision glass cockpit upgrade with ADS-B, WAAS, LPV, RNP, and SVT capabilities. Its two GE CJ610 engines are among only four ever modified with GE's Platinum single-spool compressor upgrade, offering tighter tolerances for improved start characteristics and climb performance while enabling in-place compressor maintenance.

The airframe received a full strip-and-repaint by King Aerospace in 2019 with all-new windscreens and side windows, complemented by a flawless interior designed by renowned specialist Kate Woolstenhulme, configured for 7 passengers and 2 crew with a forward lavatory. Notable features include Stage 3 hush kits, a 51,000-foot emergency pressurization system, and recent completion of 300-hour inspections (A1-A6) in 2024. The seller emphasizes this as a collector-quality aircraft, offering potential management/training services and open to fractional ownership discussions for Dallas-based operators. With its 1,400 NM range and 8,253 lb basic operating weight, this meticulously preserved 25D stands out for its low-time airframe, cutting-edge avionics, and rare engine modifications.