N90Z

This write-up concentrates on the individual airframe registered as N90Z, a Cessna-built business jet completed in 1981 and carrying serial number 550-0336. The airframe is owned by Northern Jet Inc, a corporation based in Iron Mountain, MI, US, which also serves as its primary operator/home base. Registry jurisdiction is US, with no additional public records of notable registry actions or transfers published for this specific airframe. As a 1981-built Citation II, its age and configuration frame typical valuation and condition considerations for long-serving light jets in corporate operations.

The aircraft is outfitted in an 8-place executive layout (typical for Citation II), configured for corporate passenger transport and short transcontinental missions within its published range. Avionics fit for this specific airframe is not published; operators commonly select suites that support single-pilot or two-pilot corporate operations depending on mission requirements. Based in Iron Mountain, Michigan, Northern Jet Inc typically leverages the Citation II’s cruise speed of 376 kts and 1,900 nm range for regional business routes and point-to-point charters where access to smaller fields is required. Given the airframe’s 1981 manufacture date, maintenance considerations include age-related airframe inspections and lifecycle management for its two Pratt & Whitney Canada JT15D-4 engines, with adherence to manufacturer service bulletins and recurring maintenance programs important to sustain dispatch reliability.

The Cessna 550 Citation II occupies the light twinjet niche, offering a balance of cabin comfort for eight passengers and efficient short- to mid-range performance with a 43,000 ft service ceiling. In the light corporate jet market, the Citation II competes with contemporaries in the small twinjet category, attracting buyers seeking legacy fleet economics and proven operational track records. For prospective operators and resale markets, considerations include remaining service life, avionics modernization needs, engine program status, and the aircraft’s documented maintenance history, all of which are particularly salient for a 1981 serial 550-0336 airframe.