Here's what American Airlines says:
http://www.aa.com/content/travelInformation/travelHelp/airportExpectations.jhtml
Please notice that the table of minimum arrival times and baggage check-in requirements shows:
Domestic Travel (except departing Hawaii or U.S. Virgin Islands), No Baggage to Check -- 60 minutes
Domestic Travel (except departing Hawaii or U.S. Virgin Islands), Checking Baggage -- 90 minutes
But then notice that under, "Due to lengthy TSA security checkpoint waiting times, earlier arrivals are recommended at the following airports," Orlando is one of 11 airports listed.
Other airlines may have other guidelines. Check your airline's website.
The problem with
planning to arrive at the airport just 60 minutes before your flight is that delays occur, even with the best of planning, both before you get to the airport and after you arrive. What about traffic on the way to aircraft? Or a lane closure due to construction or an accident? What about a slow rental car return or a delayed pickup by a towncar or motorcoach? What about a long line at the check-in counter and/or at the TSA security checkpoint? And Orlando is a big airport; it takes a while to navigate from the curb to the gate.
Also, keep in mind that aircraft loading begins around 30 minutes before scheduled departure, and that airlines have rules about when you have to arrive at the gate. If you're running late, you could arrive at the gate before they close the aircraft door, but the airline may already have given your seat to someone else -- and you have to fly standby on a later flight.
We try to arrive two hours before departure time. If there are no delays, we have an hour for a nice table service meal, even when you allow for security and for boarding 30 minutes before departure. After all, the airlines don't feed you any more ion domestic flights. If we run into delays, we still have time for a fast food meal.