Versions of 14 CFR 21.51 - Duration on LawServer 2024 14 CFR 21.51 – Duration 2023 14 CFR 21.51 – Duration 2022 14 CFR 21.51 – Duration 2021 14 CFR 21.51 – Duration 2020 14 CFR 21.51 – Duration 2019 14 CFR 21.51 – Duration 2016 14 CFR 21.51 – Duration 2015 14 CFR 21.51 – Duration 2014 14 CFR 21.51 – Duration 2010 14 CFR 21.51 – Duration 2009 14 CFR 21.51 – Duration
