They are unable to do so.Most aircraft don't even have microwave ovens. Not least, because of potential effects on avionics and sensors, not to mention power surge issues.
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Bread. Solid food items (not liquids or gels) can be transported in either your carry-on or checked bags. Liquid or gel food items larger than 3.4 oz are not allowed in carry-on bags and should be placed in your checked bags if possible.
If the food you're traveling with needs to stay at refrigerator temperatures, pack it in a cooler that can be counted as checked luggage. For longer flights, or times when you suspect there may be delays, consider freezing the item you're flying with, especially if it's a meat, casserole, or soup.
Meat, seafood, vegetables and other non-liquid food items are permitted in both carry-on and checked bags. If the food is packed with ice or ice packs in a cooler or other container, the ice or ice packs must be completely frozen when brought through screening.
You can take everything in your checked baggage: from liquid to solid food. However, you are not allowed to carry liquid or gel-like food products in your carry-on baggage.
The key is to choose fillings that keep well for a handful of hours without refrigeration: cheese, cured meats (think prosciutto), hummus, grilled vegetables, and greens. To prevent soggy bread, stay away from juicy fillings like sliced tomatoes and choose a thick bread like ciabatta, focaccia, or a baguette.
Food. You can carry cakes, fruit, vegetables, sandwiches and all solid foods in your hand baggage. However, foods in sauces or with a high liquid content (such as sauces, pastes, soups and stews) cannot come through security. The size of container must not exceed 100ml, regardless of the amount contained inside.
Pack snacks in individual portions that are easy to get and hand to kids one at a time. Then hand the empty baggies to the flight attendant when he comes down the aisle. You are allowed to take yogurt tubes, fruit pouches and peanut butter packets less than 3.4 ounces through security.
Dried fruits, nuts, granola bars, cereals, cracker, pretzel and cookies are all good options. Creamy items such as jams, peanut butter and yogurt however, are limited to travel-sized containers that are 3.4 ounces or less per item and will need to fit into a quart-sized bag.