My suggestion would be to have a meal before you leave home or at the airport before you depart. Purchase some protein bars and a beverage once past security for flight time snacks. Think of it as an high altitude hike and pack appropriately.

If need be, grab a bite at the airport on arrival, or when you reach your destination.

Plan around your flight, not on it, where conditions are far less than optimal for any kind of bring aboard dining.

Cheers,
Pogopossum