FYI, here are the different versions of "Applicability" from the 109th and 110th Congress. The sentences in red in the 109th version are the ones that were added in the 110th version...

109th Congress
(b) APPLICABILITY- The modification of the Federal Aviation Administration regulations under subsection (a) shall not provide the basis for a claim of seniority under any labor agreement in effect between a recognized bargaining unit for pilots and an air carrier engaged in operations under part 121 of title 14, Code of Federal Regulations, made by any pilot[a person who was a pilot and who attained 60 years of age before the effective date described in subsection (e)] seeking reemployment by such air carrier following the pilot's previous termination or cessation of employment [or promotion or transfer to another position with such air carrier] as required by section 121.323(c), title 14, Code of Federal Regulations, as that section was in effect on the date of enactment of this Act.

110th Congress
(c) Applicability- The provisions of subsection (a) shall not provide a basis for a claim of seniority under any labor agreement in effect between a recognized bargaining unit for pilots and an air carrier engaged in operations under part 121 of title 14, Code of Federal Regulations, that is made by a person who was a pilot and who attained 60 years of age before the effective date described in subsection (e) and is seeking a position as a pilot with such air carrier following that person's termination or cessation of employment or promotion or transfer to another position with such air carrier pursuant to section 121.383(c) of title 14, Code of Federal Regulations, as in effect on the day before the effective date described in subsection (e).