Reposted from Belize Forums:
Here's an extract from Tropic Air's letter they emailed out to agents...
"Due to a unilateral change in Guatemalan regulations, Tropic Air, along with all other Belizean airlines, is no longer able to provide service between Belize and Guatemala effective November 16, 2007. Tropic Air flight numbers 401, 402, 403 and 404 are canceled until further notice.
All tickets will be refunded promptly. To receive your refund please contact your Tropic Air account representative.
We at Tropic Air apologize for any inconvenience. This is certainly an uncontrolled and unfortunate event for Tropic Air, its employees and our passengers who have been flying to Guatemalan destinations for over 25 years."