Agree with PPs. Buffalo is our home airport. We're taking the Southwest flight to Orlando at 6:10am in October, and we'll plan to arrive at the airport about 4:30. Southwest starts boarding about 30 minutes before the scheduled flight time, so we like to make sure we are at that gate by then at least. You don't want to miss your boarding position with Southwest.
As far as when you'd arrive at the resort, rule of thumb is to estimate 90 minutes from the time you exit the plane to the time you arrive at the resort. There are a lot of variables so time of day, resort, etc don't necessarily matter. We've had it take longer than 90 minutes a few times, but I think that's a fair estimate.