14 CFR §135.377
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 flight plan unless the airplane (at the weight anticipated at the time of arrival at the airport), based on the assumptions in § 135.375(a) (1) and (2), can be brought to a full stop landing within 70 percent of the effective length of the runway.