Section 6-I. Airport development and amortization funds

a. There shall be a
  fund  set  up  for each airport acquired, constructed or maintained by a
  municipal   corporation,   which   fund   shall   be   known   as    the
  "................  airport  development  fund". There shall be paid into
  such fund all payments for leases, permits or other privileges  at  such
  airport,  received  prior  to its construction or to the commencement of
  its operation. All moneys paid into such fund shall be used  solely  for
  the acquisition, construction or physical development of such airport.
    b. There shall be a fund set up for each airport hereafter acquired or
  constructed by a municipal corporation, which fund shall be known as the
  "................  airport  amortization fund". There shall be paid into
  such fund all revenues derived from the operation of such airport except
  parking fees, sightseeing fees and rentals derived from leases  of  real
  property  at  such  airport  not used exclusively for air transportation
  operations. The moneys paid into such  fund  shall  be  applied  to  the
  payment   of   interest   on  and  the  retirement  of  any  outstanding
  indebtedness incurred for  the  acquisition  and  construction  of  such
  airport  but  any  balance remaining beyond the amount required for such
  purposes  shall  be  paid  into  the  general  fund  of  such  municipal
  corporation for general municipal purposes.