The list of prohibited foods on international flights is usually issued by the civil aviation authorities or airlines of each country to ensure the safe and smooth operation of flights, as well as to prevent the spread of animal and plant diseases or legal restrictions in the country of entry.

These prohibited foods usually include:

1. Liquid foods: Most international flights restrict the carrying of liquid foods, such as beverages, soups, sauces, etc., over 100 milliliters. Usually, these foods should be placed in checked baggage rather than carried on.

2. Fresh fruits and vegetables: To prevent the spread of diseases and pests, countries of entry usually restrict the carrying of fresh fruits and vegetables.

3. Meat and dairy products: Most international flights prohibit the carriage of unprocessed meat and dairy products to avoid the spread of animal diseases.

4. Manufactured and processed foods: Some countries have restrictions on the carriage of manufactured and processed foods that are untreated or do not comply with their regulations.

5. Melting foods like ice cream, jelly, chocolate, etc. may be restricted on certain flights due to safety concerns.

The rules on prohibited foods may vary from country to country and airline to airline.

So passengers are advised to check the official website of the corresponding airline or country of entry for the specific list of prohibited foods before traveling to avoid unnecessary trouble.

Meanwhile, the following items are not allowed to be carried on most airplanes:

1. Open flames and flammable items: Passengers are not allowed to bring any open flames or flammable items on international flights.

This includes lighters, matches, fuel, liquid fuels, fireworks, firecrackers, and so on. These items may cause fire or other safety issues.

2. Sharp items: Carrying scissors, and other sharp items on your person is also prohibited. These items may be used to attack others or damage airplane equipment.

3. Liquid items: For security reasons, passengers are not allowed to bring liquid items exceeding 100ml on international flights. These items include water, beverages, perfumes, cosmetics, liquid medicines, body lotions, etc.

All liquid items must be placed in a transparent plastic bag, and each person can carry no more than 1 liter of liquid items per bag.

4. Dangerous chemicals: Passengers are not allowed to carry any dangerous chemicals, such as oxidizers, organic peroxides, drugs, etc. on international flights. These items may cause serious harm to the human body and the environment.