Section 13. All sums received from the excise imposed on aviation fuel, and related penalties, forfeitures, interest, costs of suits and fines, less all amounts for reimbursement under sections 7 and 7A, shall be credited to the Commonwealth Transportation Fund and may be used for airport development projects approved and carried out at airports and landing facilities under 49 U.S.C. App. s 2210; and all other sums received from the excise imposed in section 4, and related penalties, forfeitures, interest, costs of suits and fines, less all amounts for reimbursement under said sections 7 and 7A, shall be credited as follows: (i) 99.85 per cent shall be credited to the Commonwealth Transportation Fund to be used for transportation-related purposes; and (ii) 0.15 per cent shall be credited to the Inland Fisheries and Game Fund established in section 2C of chapter 131.