---
kind: "unit"
title: "14"
title_heading: "Aeronautics and Space"
key: "chI/subchG/part121/subpartQ"
level: "subpart"
label: "Subpart Q"
heading: "Flight Time Limitations and Rest Requirements: Domestic Operations"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/14/chI-subchG-part121-subpartQ"
sections_count: 3
---

# Subpart Q — Flight Time Limitations and Rest Requirements: Domestic Operations

Title 14 C.F.R. — Aeronautics and Space › Chapter I — Federal Aviation Administration, Department of Transportation › Subchapter G — Air Carriers and Operators for Compensation or Hire: Certification and Operations › Part 121 — Operating Requirements: Domestic, Flag, and Supplemental Operations

## Sections

- [§121.470. Applicability.](/cfr/14/121.470.md)
- [§121.471. Flight time limitations and rest requirements: All flight crewmembers.](/cfr/14/121.471.md)
- [§121.473. Fatigue risk management system.](/cfr/14/121.473.md)