It's there. You have to click the link for your "Sailing from...
location. Then scroll to "Guests Arranging Independent Air Travel" (below the "Luggage Tags" section) and see the 2nd bullet (italics and color is mine):
Guests Arranging Independent Air Travel
For the Fort Lauderdale to Fort Lauderdale sailings in 2024, we recommend the following flight-time guidelines:
- Latest arrival time to Fort Lauderdale-Hollywood International Airport on embarkation day: 2:00 PM for domestic flights and 1:00 PM for international flights
- Earliest departure time from Fort Lauderdale-Hollywood International Airport on debarkation day: 11:00 AM
That said, if using uber/lyft or taxi you can make an earlier flight. But DCL won't allow an earlier flight if taking DCL Transfers.