Most airlines now offer vegetarian food. Telephone reservation is required before departure. It is recommended to confirm it twice. Different kinds of vegetarianism have different international standard codes, and there are usually four kinds of vegetarianism. Passengers are advised to clearly indicate the code when requesting vegetarian service from airlines or travel agencies to avoid mistakes, and then confirm it 24 hours before departure and reconfirm it when they get their boarding pass at the airport. Code Description (from Air Canada): Passengers can request different vegetarian meals for religious, health, economic or political reasons, environmental protection, humanitarian and other reasons. These different types of vegetarian meals can be summarized as follows. Western vegetarians. Milk egg element does not eat any kind of meat and meat products, fish, poultry and foods containing lard or gelatin. You can eat dairy products and eggs. Cheese must be as free of curds as possible? (chymosin) Oriental vegetarian-Asian/Indian vegetarian-Muslim or Indian vegetarian. Asian/Indian vegetarian food may contain peppers or other spices, and may also contain a small amount of dairy products. RVML raw eaters-raw vegetables, including fresh fruits and/or vegetables. Supplementary explanation about the types of vegetarians (from Air Canada): Some vegetarians do not eat certain other foods or drinks, such as alcoholic or caffeinated drinks, processed foods, foods that are not organically grown, and foods that contain certain additives or preservatives. Other codes/vegetarian: Individual airlines may have other codes and vegetarian standards. For example, United Airlines offers IVML- Indian vegetarian food and KVML- Jewish vegetarian food. An international airline (Air Canada) claims that in order to meet your requirements, we hope that you can make a reservation 18 hours before departure, while Jewish vegetarian food specifically requires a reservation 24 hours in advance. Other airlines may have similar requirements.