From the Yellow Pages:

Maya Island Air
Administration # 011-501-223-5794 or 5794
Fax: 011-501-223-0576
Engineering#: 011-501-225-2643
Fax: 011-501-225-2655
P.O. Box 458, Belize City, Belize, Central America
Email: [email protected]
Website: http://www.mayaislandair.com
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Tropic Air
Tel: 011-501-224-5671
Fax: 011-501-226-2338
Email and website not listed but I think the website is: http://www.tropicair.com
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Javier's Flying Services, Ltd.
011-501-223-5360 or 1029 or 224-5332
After Hours: 011-501-223-2173
Fax: 011-501-223-1731
No email or website listed
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Caribee Air Service
011-501-224-4253 or 223-3542
After Hours: 011-501-227-4006
Fax: 011-501-223-1031
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Hope this helps