---
kind: "section"
citation: "14 C.F.R. § 121.623"
title: "14"
number: "121.623"
heading: "Alternate airport for destination: IFR or over-the-top: Supplemental operations."
url: "https://uscodex.org/cfr/14/121.623"
---

# §121.623. Alternate airport for destination: IFR or over-the-top: Supplemental operations.

- (a) Except as provided in [paragraph (b)](#b) of this section, each person releasing an aircraft for operation under IFR or over-the-top shall list at least one alternate airport for each destination airport in the flight release.
- (b) An alternate airport need not be designated for IFR or over-the-top operations where the aircraft carries enough fuel to meet the requirements of §§ [121.643](/cfr/14/121.643.md) and [121.645](/cfr/14/121.645.md) for flights outside the 48 contiguous States and the District of Columbia over routes without an available alternate airport for a particular airport of destination.
- (c) For the purposes of [paragraph (a)](#a) of this section, the weather requirements at the alternate airport must meet the requirements of the certificate holder's operations specifications.
- (d) No person may release a flight unless he lists each required alternate airport in the flight release.

## Notes

### Amendments

[Docket 6258, 29 FR 19222, Dec. 31, 1964, as amended by Amdt. 121-253, 61 FR 2614, Jan. 26, 1996]

### Source

Source: Docket 6258, 29 FR 19222, Dec. 31, 1964, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 106(f), 40103, 40113, 40119, 41706, 42301 preceding note added by Pub. L. 112-95, sec. 412, 126 Stat. 89, 44101, 44701-44702, 44705, 44709-44711, 44713, 44716-44717, 44722, 44729, 44732; 46105; Pub. L. 111-216, 124 Stat. 2348 (49 U.S.C. 44701 note); Pub. L. 112-95, 126 Stat. 62 (49 U.S.C. 44732 note); Pub. L. 115-254, 132 Stat. 3186 (49 U.S.C. 44701 note).

### Amendments

[Docket 6258, 29 FR 19222, Dec. 31, 1964, as amended by Amdt. 121-253, 61 FR 2614, Jan. 26, 1996]