N939DC · Cessna Citation SII flight activity
15 tracked flights in the 12 months to 31 Jul 2026, on about 1 days a month and an estimated 17 hours in the air.
How N939DC has been flying
N939DC flies about as often as the middle Citation SII, inside the 3 to 6 flights a month flown by the middle half of the fleet.
Tracked by ADS-B, so a minimum.
From time in the air. The logbook has the exact total.
Against 2.9 d for the middle Citation SII.
Last tracked in June 2026. Published seven days later, by month only.
Month by month
15 flights over 6 active monthsFlights per month · shaded band is the middle half of the fleet (2.8–5.8 a month)
N939DC flew more than the middle half of the fleet in 1 of 12 months. Its busiest month was February 2026, with 6 flights.
Its busiest month was February 2026, with 6 flights. It did not fly in August 2025. The record has 5 tracking gaps, so about one flight in 3 may be missing and every count is a minimum.
Utilization
How steadily it has been used: flights, flying days and estimated hours against the type.
Flown less than most. Gentler on utilization.
Light use spends maintenance intervals slowly, but long spells parked bring their own wear: seals, corrosion and preservation. Worth asking how it was stored.
Against 3.8 for the middle Citation SII (22nd). Used more lightly than most.
Share of flying days from one field.
The data behind it
Against all 353 tracked Citation SIIs, over its record since 1 Jan 2025.How it travels
One corridor carries a large share of its flights.
4 of 15 flights, both directions.
Most of its flying on three routes.
0 flights crossed a border.
One route carries a large share of N939DC’s flying: 27% of flights are on its most-flown pair of airports. Its top three pairs make up 60%, so about four flights in ten go somewhere else. None of its tracked flights crossed a border.
Fatigue, corrosion, engines and brakes
01 Fatigue
Close to the typeHow short were its legs? Airframes age by landings as well as by hours. Many short legs put more pressurization cycles on the structure for the same time in the air.
N939DC is in here
Also graded: short hops. Leg length is shown as context. See this chapter in the sample report →
02 Corrosion
Outside the middle of the fleetWhere does it spend its nights? Where a jet sleeps shapes how fast it corrodes. Salt and damp overnight are what an inspector looks at first.
N939DC is out here, on one side or the other
Also graded: damp air, freeze–thaw, near the coast and moisture in the air. See this chapter in the sample report →
03 Engines and brakes
Outside the middle of the fleetHow hard were its airfields? Short, hot and high runways ask for more thrust on every takeoff and harder braking on every landing. That wear doesn’t show in the hours.
N939DC is out here, on one side or the other
Also graded: hot, high takeoffs; density altitude; dust and dry climate. See this chapter in the sample report →
What the full report adds for N939DC
- 01 All four chapters graded, with the evidence behind every grade
- 02 The operational summary: the whole aircraft in one read
- 03 Its longest stay away from base, and what the record does and doesn’t show about it
- 04 Its home base pattern and operating rhythm: busiest days and months
- 05 PDF, CSV and a share link
$395 for N939DC, one payment
A fraction of the cost of a pre-buy inspection, before you book one.
Other Citation SIIs
Tails flown at a similar rate, with their tracked flights in the 12 months to 31 Jul 2026. Each has its own free page.
About N939DC
How many hours does N939DC fly a year?
About 17 estimated hours in the 12 months to 31 Jul 2026, across 15 tracked flights. Hours are estimated from time in the air, so the logbook has the exact figure.
How often is N939DC flown?
N939DC made 15 tracked flights in the 12 months to 31 Jul 2026, about 1 a month, and flew on about 1 days in each month it flew.
Does N939DC fly internationally?
None of its 15 tracked flights in the 12 months to 31 Jul 2026 crossed a border.
When did N939DC last fly?
It was last tracked in June 2026. We publish an aircraft’s flights seven days after they happen, and show them by month only.
Why don’t you show which airports N939DC uses?
We leave out airports, bases and exact dates on purpose. We show how an aircraft has been used, not where it goes.
What’s in the full TailCheck report for N939DC?
All four graded chapters (Fatigue, Corrosion, Engines and brakes, and Utilization), each against the tracked Citation SIIs, plus the operational summary and operating rhythm, as a PDF, CSV and share link. It costs $395, or $995 a month for unlimited reports and Spotlight.
How this page is made
Everything here comes from N939DC’s ADS-B track, the position signal aircraft broadcast, over the 12 months to 31 Jul 2026. ADS-B misses some flights, so every count is a minimum. Flights appear seven days after they happen, by month only, and hours are estimated from time in the air; the logbook has the real totals. Airports, bases and exact dates are left out on purpose. How grades work: each graded measure is placed among the tracked Citation SIIs against the middle aircraft, the 50th percentile. Between the 25th and 75th it is typical; outside that band it is gentler or harsher. Utilization is graded here for free; for the other chapters this page shows the middle value of the fleet and whether this aircraft sits inside the middle half or outside it. Their grades and values are in the report, not on this page. Owners and operators can ask us not to publish an aircraft’s activity.