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14CFR121

14 CFR Part 121 - Operating Requirements: Domestic, Flag, and Supplemental Operations

Read the current text of this federal regulation online on the eCFR, free.

Publisher
FAA
Edition
eCFR full-part XML as of 2026-08-01 (Title 14)
Last verified
October 2026
Read the current text on eCFR
Regulation

Read the current text on eCFR

14 CFR Part 121 - Operating Requirements: Domestic, Flag, and Supplemental Operations is a federal regulation, not a fixed PDF. It is amended in place, so the authoritative version is the live electronic Code of Federal Regulations. Aviator IQ questions that cite it carry the exact regulatory text they test, checked against the edition below.

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What this regulation covers

A section-by-section map of 14CFR121. Every topic below is something the exams built on this source can ask about, and on Aviator IQ each of those questions carries a verbatim quote from this document, so you can trace an answer straight back to the page it came from.

  1. 01Operating requirementsThe rules for domestic, flag, and supplemental air carrier operations that the ATP and airline environment run on.
  2. 02Flight crew and dutyCrewmember qualifications, training, and the dispatch and operational-control requirements.
  3. 03Equipment and maintenanceThe airplane equipment, instruments, and continuous-maintenance program an air carrier must hold.

Why Aviator IQ cites this source

14 CFR Part 121 - Operating Requirements: Domestic, Flag, and Supplemental Operations is a US government public-domain document. Every Aviator IQ question that draws on it stores the exact sentence it tests and checks that quote against this edition (eCFR full-part XML as of 2026-08-01 (Title 14)), last verified October 2026. If the FAA reissues it, the citing questions are pulled for review before the new edition ships.