14 CFR §121.205
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
No person may list an airport as an alternate airport in a dispatch or flight release for a nontransport category airplane unless that airplane (at the weight anticipated at the time of arrival) based on the assumptions contained in § 121.203, can be brought to a full stop landing within 70 percent of the effective length of the runway.