Oh, you have to be at the airport in 90 minutes, but you have time for a sit-down meal at a restaurant? Tell me more. Tell me why you think that's a good choice. International flights can cause long lines to get through security---these notoriously take ages to get through. Oh, you're only 25 minutes from the airport? I'm sure there will be no traffic, red lights, or slow drivers to stop you from getting on your flight. Truly, if you decide to have a sit-down meal outside the airport when you h…