I have to wonder whether this is likely but I thought it was worth posting. I just don't see how Belize can support two international airports with a small population (331,900 in 2013 according to Wikipedia). But, stranger things have happened.
PM Barrow announces international airport to come to North Ambergris Caye - The San Pedro Sun News
PM Barrow announces international airport to come to North Ambergris Caye - The San Pedro Sun News