14 CFR §121.513
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
In place of the flight time limitations in §§ 121.503 through 121.511, a certificate holder conducting supplemental operations may elect to comply with the flight time limitations of §§ 121.515 and 121.521 through 121.525 for operations conducted—