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# What Is Part 91K in Business Aviation?
- URL: https://www.acmiworld.com/what-is-part-91k-in-aviation/
- Published: 2026-09-14T16:35:40.000Z
- Updated: 2026-09-14T16:35:40.000Z
- Description: Part 91K defined for aviation professionals, with its operational or commercial use, document context and related terminology.
- Author: ACMI World
- Tags: Aviation Glossary, Business Aviation & Charter, #Import 2026-09-14 15:41

## Definition, Documents and Application

Part 91K is the U.S. operating framework for qualifying fractional ownership program operations.

Aviation Glossary

**Term:** Part 91K

**Category:** Business Aviation & Charter

## Where the Term Appears

Part 91K can affect charter agreements, management contracts, jet card terms, operating rules or trip quotations. The buyer should identify which legal entity is the operator and which party is only arranging or administering the service.

## Commercial Effect

It adds specific program-manager, crew, maintenance and operational requirements beyond ordinary Part 91 private operations.

## What the Buyer Should Confirm

Confirm the operating rule, contracting entity, aircraft category, taxes, positioning, cancellation rights, substitution provisions and any conditions attached to quoted rates or availability.

## Related Aviation Topics

Related ACMI World coverage includes [international charter planning](https://www.acmiworld.com/international-charter-guide-for-business-flyers/), [vetting charter operators](https://www.acmiworld.com/how-to-vet-charter-operators-before-you-book/), [comparing charter quotes](https://www.acmiworld.com/how-to-compare-charter-quotes-without-missing-costs/), [jet card structures](https://www.acmiworld.com/jet-card-structure-explained/) and [dry lease versus charter](https://www.acmiworld.com/dry-lease-versus-charter-which-model-fits/).

It adds specific program-manager, crew, maintenance and operational requirements beyond ordinary Part 91 private operations.

Frequently Asked Questions

## Part 91K FAQ

What does Part 91K mean in aviation?

Part 91K is the U.S. operating framework for qualifying fractional ownership program operations.

Why does Part 91K matter?

It adds specific program-manager, crew, maintenance and operational requirements beyond ordinary Part 91 private operations.

Where would an aviation professional encounter Part 91K?

It is commonly encountered in business aviation & charter documents, procedures, calculations or operating discussions where the underlying technical or commercial issue is relevant.

Should the term be checked in the charter or program contract?

Yes. Commercial aviation products often use familiar labels with specific program conditions, exclusions and fees that only appear in the contract.