14 CFR §91.867

1. (a)New entrant U.S. air carriers.
   1. (1)A new entrant initiating operations under part 121 of this chapter on or before December 31, 1994, may initiate service without regard to the percentage of its fleet composed of Stage 3 airplanes.
   2. (2)After December 31, 1994, at least 25 percent of the fleet of a new entrant must comply with Stage 3 noise levels.
   3. (3)After December 31, 1996, at least 50 percent of the fleet of a new entrant must comply with Stage 3 noise levels.
   4. (4)After December 31, 1998, at least 75 percent of the fleet of a new entrant must comply with Stage 3 noise levels.
2. (b)New entrant foreign air carriers.
   1. (1)A new entrant foreign air carrier initiating part 129 operations on or before December 31, 1994, may initiate service without regard to the percentage of its fleet composed of Stage 3 airplanes.
   2. (2)After December 31, 1994, at least 25 percent of the fleet on U.S. operations specifications of a new entrant foreign air carrier must comply with Stage 3 noise levels.
   3. (3)After December 31, 1996, at least 50 percent of the fleet on U.S. operations specifications of a new entrant foreign air carrier must comply with Stage 3 noise levels.
   4. (4)After December 31, 1998, at least 75 percent of the fleet on U.S. operations specifications of a new entrant foreign air carrier must comply with Stage 3 noise levels.
3. (c)Calculations resulting in fractions may be rounded to permit the continued operation of the next whole number of Stage 2 airplanes.