Tropic Air will do charters from Cayo to Ambergris or Caye can get a 3 seater, 6 seater or 14 seater charter. any one of our offices can be contacted to book the flight, but preferably san pedro office at: (501)226-2012. booking a day in advance is preferable but not necessary. there is an airstrip called Central Farm which is only about a 10 min drive from san igancio town. there is also a runway right at Blancanaux Lodge in Mountain Pine Ridge.
hope this helps