As compensation for collecting, handling and remitting the PFC revenue, the collecting air carrier shall be entitled to:

(a) Retain $0.12 of each PFC remitted on or before June 28, 1994. Thereafter, air carriers shall be entitled to $0.08 of each PFC remitted; and

(b) Any interest or other investment return earned on PFC revenue between the time of collection and remittance to the public agency.