Grizzly Bulls
Financial research concept

Aircraft Lessor Weighted Average Fleet Age

measures portfolio age using the issuer's weighting method, which can make the result economically different from a simple average of aircraft tail ages.

By Lee BaileyPublished Sep 28, 2026
Research context

See what supports this page, how current it is, and where comparable or historical context is available.

Research date
Sep 28, 2026Use the dated article and cited sources for the definition, examples, and stated limitations.
Operating-model context
13 connected conceptsPart of the reviewed Aircraft Leasing Economics; issuer definitions remain distinct where disclosed.
Company examples
1 reviewed companyRelationships reflect supported examples, not a normalized cross-company KPI ranking.
  1. Value weighting changes the answer
  2. AerCap was buying newer aircraft and selling older ones
  3. Age is a clue, not a residual-value formula
  4. Part of the Aircraft Leasing Economics
  5. See It in Company Research
  6. Continue Research

Aircraft lessor weighted average fleet age measures the age of the leased aircraft portfolio after applying the lessor's stated weighting method. AerCap's owned passenger aircraft fleet had a 7.3-year average age at December 31, 2025, weighted by net book value.

Value weighting changes the answer

A simple tail-count average gives every aircraft the same weight. AerCap's measure gives more influence to aircraft with larger net book values.

That matters in a mixed fleet. A group of newer, higher-value aircraft can pull the weighted average lower even if the company still owns a meaningful number of older aircraft.

Investors should therefore preserve the weighting basis when comparing fleet-age disclosures across lessors.

AerCap was buying newer aircraft and selling older ones

In 2025 AerCap purchased 71 fuel-efficient new-technology owned aircraft. It also sold 108 owned aircraft with an average age of 15 years.

Those transactions illustrate how fleet renewal works from both sides. The aircraft order book feeds newer assets into the portfolio while asset sales can remove older equipment and realize residual value.

Age is a clue, not a residual-value formula

Aircraft age affects maintenance needs, lease demand, fuel efficiency, financing, and resale markets, but age alone doesn't determine value. AerCap identifies aircraft condition, interest rates, airline demand, and asset-type supply and demand as important factors in gain on sale.

Fleet age is therefore best used as context for renewal and residual-value exposure, not as a standalone valuation score.

Primary source: AerCap 2025 Form 20-F.

Part of the Aircraft Leasing Economics

Connect aircraft deployment and recurring lease revenue with financing spread, depreciation, maintenance obligations, residual-value realization, and fleet renewal.

Browse the full operating model in Company Analysis →
Where this concept fits
  • Fleet renewal and residual-value realizationCurrent relationship
    The order book supplies the future aircraft pipeline, value-weighted fleet age shows how renewal changes the owned passenger portfolio, and gains on asset sales show realized residual-value outcomes from aircraft and other flight-equipment disposals.
    Aircraft Order BookNet Gain on Sale of AssetsWeighted Average Fleet AgeCurrent concept
  • Asset deployment, recurring rent, and financing spread
    Utilization shows how much owned aircraft value is deployed, basic and maintenance rents separate recurring lease economics from maintenance-related receipts, average lease assets supply the capital denominator, and the two net-spread measures show financing economics before and after depreciation and amortization.
    Annualized Net SpreadAverage Lease AssetsBasic Lease RentsMaintenance RentsNet Spread After DepreciationOwned Aircraft Utilization
  • Maintenance condition and acquired-lease accounting
    Maintenance rights capture acquired contractual maintenance condition, accrued maintenance liabilities capture timing and reimbursement obligations, end-of-lease compensation settles aircraft condition at redelivery, and lease premium captures acquired above-market rents that are amortized against lease revenue.
    Accrued Maintenance LiabilityEnd-of-Lease CompensationLease PremiumMaintenance Rights

See It in Company Research

These companies are examples of how the concept is reported or discussed in public filings. Definitions can differ by issuer; these links open company research rather than a normalized metric comparison.

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Compare fleet renewal profiles

Compare aviation asset portfolios while preserving whether fleet age is weighted by aircraft count, value, or another issuer-defined base.

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