Here is a diet chart for air travel (assuming the person is on flight during the day and reaching in the evening or night):
Night before the flight: Pack nuts, dry fruits, granola bars and sandwiches in small air-tight containers. A boiled potato or sweet potato is also fine and easy to carry. You could have it with lemon, salt, cumin powder and red chilli powder. Low-fat yoghurt is easy to pack. Bread is a good alternative to potatoes.
Morning of flight: Have two glasses of water as the flight takes off. This can prevent ear pressure. Then have a fruit or dry fruits. Mid-fl ight: Have 20 almonds or 40 pistachios. During the flight, have at least a litre of water.
Lunch: One vegetable sandwich
Snacks: Have a handful of raisins or five to six dates, prunes, figs or apricots and a whole-grain granola bar. Snack on some fresh fruit if you feel hungry again.
Dinner or lunch on landing: A salad plate, vegetable soup, two rotis/ idlis/dosas/ whole-wheat breads or a bowl of rice plus a bowl of curd or dal or a piece of grilled chicken or fish. Avoid oily food. If you cannot pack food, order a heart-friendly meal and carry your own fruits, nuts and dry fruits to supplement it as and when you feel hungry.
(In arrangement with SMARTlife)