I have an early flight. What time does the terminal open?

Smooth and easy....always

For domestic flights get there 90 minutes prior, fairly certain its open if there are flights so probably 24/7.

Never had a problem getting to gate and 1 hr before boarding

Not necessary to arrive PBI more than an hour before your flight-especially in the summer. They rarely have long lines & even if they do, it moves fast

Without being snarky, at least two hours before your flight. Because that's what they recommend you be there.