Has to be because planes fly in 24/7 365 days a year. The restaurants and other food services are not open 24 hours though.
No they are not dont let these people fool you.... their normal business hours are from 9-5 like any other business. If you have a flight that comes in from 5pm-9am then you will need to stay seated on the plane. In first class this is usually not a bad deal but in coach its really tough in those uncomfortable chairs surviving off one micro bag of peanuts.....
Yes, there is public access to the terminal buildings 24 hours a day, however many services are closed when no flights are scheduled.
All Airports are open 24 hours (at least in the US).
No they are only til 9pm monday thru saturday and til 7pm on sundays
yes it is. lived there for 16 years