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Tail record, Bombardier Challenger 600 (Challenger 604), United States register

N309KB: how this Bombardier Challenger 600 is flown

Legs like most Challenger 600s: inside the middle half of its type on hours per landing.

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Figures are for the twelve months to 31 Jul 2026; named aircraft are shown a week behind. Grades compare its record since 1 Jan 2025 with every tracked Challenger 600.

01

How N309KB compares.

46 tracked flights in the twelve months to 31 Jul 2026.

Tracked flights

46

in the twelve months, about 4 a month

Days flown a month

2.7

in the months it flew

Estimated hours

≈65

in the twelve months, from time in the air

02

Month by month.

Its busiest month was July 2026, with 10 flights.

Tracked flights

Its busiest month was July 2026, with 10 flights. It did not fly in November 2025. The record has 30 tracking gaps, so about one flight in 2 may be missing and every count is a minimum.

Source: The Aircraft Ledger, flight data for N309KB, the twelve months to 31 Jul 2026. Flight counts only: airports and exact dates are left out of this page.

03

The free chapter.

Each measure against all 763 tracked Challenger 600s. Every dot is one aircraft; the gold one is N309KB.

Chapter 1

Fatigue

Typical for its type

How short were its legs?

Utilization isn’t graded for N309KB: too few of its flights were tracked to count its use fairly, in the full report too. So its free chapter here is Fatigue, which doesn’t depend on catching every flight.

It lands about as often for its hours as most of the fleet, so cycles have built up at a normal pace.

  • Hours per landingLead measure. 33rd percentile

    1.6 : 1middle Challenger 600 1.8 : 1

  • Short hops32nd percentile

    28%middle Challenger 600 34%

  • Leg length62nd percentile

    567 nmmiddle Challenger 600 494 nm

How its legs split

Share of N309KB’s legs by length, nm, in the twelve months

Harsher means harder on the aircraft than three quarters of Challenger 600s; typical is the middle half. Percentiles compare this aircraft with every tracked Challenger 600, over its record since 1 Jan 2025.

04

What only the report shows.

The fleet is shown, and whether N309KB sits inside its middle half. Its grades and values are in the full report.

Chapter 2

Corrosion

Salt air, middle Challenger 600: 2%

Also graded: damp air, freeze–thaw, near the coast and moisture in the air.

Not graded: not enough data.

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Chapter 3

Engines and brakes

Short runways, middle Challenger 600: 27%

Also graded: hot, high takeoffs; density altitude; dust and dry climate.

N309KB sits inside the middle half. Its grade and exact place are in the full report.

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Chapter 4

Utilization

Flights a month, middle Challenger 600: 6.1

Also graded: days flown a month and estimated hours a year.

Not graded: too few of its flights were tracked.

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05

The full report on N309KB.

All four chapters, every flight since January 2025 leg by leg, and the one thing to ask the seller.

TailCheck report

N309KB, Bombardier Challenger 600

$395one aircraft

  • All four chapters, graded
  • The one thing to ask, with records to request
  • Every flight since January 2025, leg by leg
  • Its weekly and seasonal rhythm
  • PDF, CSV and a share link; open for three months, kept up to date
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Weighing it against other Challenger 600s? Put it on a Spotlight board with up to four others. Included with Unlimited, $995 a month.

06

Questions about N309KB.

Cite this data

The Aircraft Ledger. “N309KB: how this Bombardier Challenger 600 is flown.” Data through 31 Jul 2026. theaircraftledger.com/aircraft/n309kb

How many hours does N309KB fly a year?

About 65 estimated hours in the 12 months to 31 Jul 2026, across 46 tracked flights. Hours are estimated from time in the air, so the logbook has the exact figure.

How often is N309KB flown?

N309KB made 46 tracked flights in the 12 months to 31 Jul 2026, about 4 a month, and flew on about 3 days in each month it flew.

Does N309KB fly internationally?

1 of its 46 tracked flights in the 12 months to 31 Jul 2026, 2%, crossed a border.

When did N309KB last fly?

It was last tracked in July 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 N309KB 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 N309KB?

All four graded chapters (Fatigue, Corrosion, Engines and brakes, and Utilization), each against the tracked Challenger 600s, 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.

Fleet statisticsWhat’s normal for a Bombardier Challenger 600Buyer’s guideWhat to check before buying a used Challenger 600SpotlightCompare N309KB with other Challenger 600s

Method: flight data, every count a minimum. Estimated hours from time in the air. About our data

Owners and operators can ask us not to publish an aircraft. Data policy and opt-out

Not a substitute for a pre-purchase inspection or records review. TailCheck shows how an aircraft has been used, not its condition.