My TA booked the flight and cruise through Carnival. The flight leaves the same day as my cruise. My question is: Am I covered somehow if my flight is late? I have travel insurance, but I was wondering if Carnival covers me anyway.
Somewhat yes. If it is booked through Carnival's Fly Aweigh program. They are supposed to "guarantee" to get you to the port, or next port of call as long as it is not in violation of the Jones Act.
They will arrange for accommodations, flights, and ground transfers if needed.
I strongly suggest that you contact your TA for all the details. I would also recommend that you keep Carnival's Travel Hotline number handy should a problem arise.