Any flight heading from the northeast (NY, NJ, MASS, etc.) to south Florida around Labor Day.
Any flight heading from south Florida to the northeast around Memorial Day.
These mark the beginning and ending of 'snowbird season' to south Florida, where all the retired folk come down from various cold and rainy parts to spend their winter months in paradise.
Summer is a dead zone in south Florida, as they're all gone.
We get lots of Canadians as well, especially from Quebec.