This part applies to certificated air carriers who terminate or suspend service to a point, or in a market, and to all air carriers who terminate, suspend, or reduce service below the level of essential air service under 49 U.S.C. 41731-41742. [Doc. No. 82, 50 FR 2430, Jan. 16, 1985, as amended by Doc. No. OST-96-1269, 61 FR 19165, May 1, 1996]