Unlike arriving in Europe, arriving in the US with a connecting flight is a time consuming PITA. As stated above, there is no "in transit" status.
You have to process Immigration (a new "kiosk" system is coming in, requires time to figure it out).
Then you have to get your baggage.
Then you have to process Customs. (often, but not always, quick)
Then you have to recheck your baggage for your connecting flight.
Then you have to re-enter security, along with everyone else flying that day.
Then you have to get to your connecting gate.
All of this while being constantly yelled at as if you are in the prison chow line.
Last month at Atlanta this took me exactly 2 hours 15 minutes. Last year at Newark it was just short of 3 hours. Miami wasn't too bad at 5am recently.
Orlando should not be the worst, but to me any connect time under 2.5 hours is risky.