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Tail record, Bombardier Learjet 45, United States register

N451SD: how this Bombardier Learjet 45 is flown

A Learjet 45 on long legs: fewer landings for its hours than three quarters of its type.

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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 Learjet 45.

01

How N451SD compares.

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

Tracked flights

19

in the twelve months, about 2 a month

Days flown a month

2.0

in the months it flew

Estimated hours

≈31

in the twelve months, from time in the air

02

Month by month.

Its busiest month was March 2026, with 4 flights.

Tracked flights

Its busiest month was March 2026, with 4 flights. It did not fly in August 2025. The record has 15 tracking gaps, so about one flight in 1 may be missing and every count is a minimum.

Source: The Aircraft Ledger, flight data for N451SD, 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 480 tracked Learjet 45s. Every dot is one aircraft; the gold one is N451SD.

Chapter 1

Fatigue

Gentler than its type

How short were its legs?

Utilization isn’t graded for N451SD: 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.

More hours for each landing, so fewer pressurization cycles for its time in the air.

  • Hours per landingLead measure. 76th percentile

    1.6 : 1middle Learjet 45 1.4 : 1

  • Short hops30th percentile

    29%middle Learjet 45 37%

  • Leg length61st percentile

    477 nmmiddle Learjet 45 431 nm

Harsher means harder on the aircraft than three quarters of Learjet 45s; typical is the middle half. Percentiles compare this aircraft with every tracked Learjet 45, over its record since 1 Jan 2025.

04

What only the report shows.

The fleet is shown, and whether N451SD sits inside its middle half. Its grades and values are in the full report.

Chapter 2

Corrosion

Salt air, middle Learjet 45: 1%

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 Learjet 45: 8%

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

N451SD 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 Learjet 45: 6.3

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 N451SD.

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

TailCheck report

N451SD, Bombardier Learjet 45

$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 Learjet 45s? Put it on a Spotlight board with up to four others. Included with Unlimited, $995 a month.

06

Questions about N451SD.

Cite this data

The Aircraft Ledger. “N451SD: how this Bombardier Learjet 45 is flown.” Data through 31 Jul 2026. theaircraftledger.com/aircraft/n451sd

How many hours does N451SD fly a year?

About 31 estimated hours in the 12 months to 31 Jul 2026, across 19 tracked flights. Hours are estimated from time in the air, so the logbook has the exact figure.

How often is N451SD flown?

N451SD made 19 tracked flights in the 12 months to 31 Jul 2026, about 2 a month, and flew on about 2 days in each month it flew.

Does N451SD fly internationally?

None of its 19 tracked flights in the 12 months to 31 Jul 2026 crossed a border.

When did N451SD 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 N451SD 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 N451SD?

All four graded chapters (Fatigue, Corrosion, Engines and brakes, and Utilization), each against the tracked Learjet 45s, 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 Learjet 45Buyer’s guideWhat to check before buying a used Learjet 45SpotlightCompare N451SD with other Learjet 45s

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.