Check your airport map to see what outlets are near your airline - sometimes there are no viable food outlets when I travel. And check your airline for buy on board - you may be surprised. I like United's RiteBite box for $5 - hummus, organic crackers, pita chips, Toblerone, cheese, can of tuna, and box of raisins. Enough for two - I actually buy a box most flights and put it in my laptop bag for those times that I arrive late at night - instant dinner in the hotel room!