The Disboards equivalent for airline knowledge is flyertalk.com.
This thread should answer all your questions.
https://www.flyertalk.com/forum/del...d-service-definitive-thread-2018-edition.html
An excerpt from the thread:
7. SPECIAL MEALS:
Delta offers special meals for a variety of dietary restrictions on all flights in all cabins with complimentary
meal service.
Special meal service is not offered for domestic flights that only offer snack or refreshment service.
To know if Delta considers what you are being served a meal, check the "meal service" in your reservation or on the booking page while purchasing a ticket. It needs to read "breakfast", "lunch" or "dinner" for this to be a meal service that you can order a special meal for. If it reads "snack" or "refreshments" there will not be special meals available.
You can select special meals by viewing your reservation online or by calling Delta.
-Special meals are not available on flights departing ABQ, ELP, or TUS.
-Special meals are not available on Delta Connection flights.
-The same meal may be served across multiple categories (i.e. the same physical meal may be served for Bland/Diabetic/Low Fat/Low Sodium/Vegetarian).
-Please note that mistakes are widely reported. Confirm your meal request with a gate agent and flight attendant. Passengers with special dietary needs are strongly advised to bring their own snacks in case a catering error occurs.
Sample Special Meals
Meal descriptions are Delta's words. Your Meals May Vary.
• Asian Vegetarian Meal (code AVML) - This is a non‐strict vegetarian meal which is prepared in an Indian style and is usually spicy. No meat, seafood or egg is allowed. This meal may include dairy products.
• Baby Meal (code BBML) - Baby food usually boarded in portion jars. (May contain strained fruit, vegetables, meats, desserts, milk & juices.)
• Bland Meal (code BLML) - For those with digestive tract and stomach disorders. Excludes mustard, pickles, garlic, fried and fatty foods.
• Child Meal (code CHML) - Available for children from 2-12 years of age, and includes food offerings which appeal to children. The meals planned follow Recommended Dietary Allowances for children.
• Diabetic Meal (code DBML) - For those who need to manage blood sugar levels. Foods excluded are high in sugars. ( Avoid syrups, jams, cakes and chocolate, unless specifically designed for diabetics.)
• Gluten Free Meal (code GFML) - Foods excluded are wheat or wheat flour, barley oats and rye, bread, cakes (unless wheat free), pastry, sausages or any flour based products. (Allergy related)
• Hindu Meal (code HNML) - Spicy vegetarian combinations with limited use of dairy products. While our meals are meat‐free, some individuals with this diet consume meats of non‐beef/veal/pork origin.
• Japanese Meal (code JPML) - Traditional Multi Course Kaiseki Style Japanese Meal accompanied by steamed rice, miso soup, Japanese pickles and green tea.
Available only to D1 customers flying between the USA/Hawaii-Japan.
• Kosher (code KSML) - Kosher meals are prepared by Kosher caterers under Rabbinical supervision and may also incorporate fresh fruit or sealed items, such as individually packaged bagels that meet Kosher laws. Special Kosher for Passover meals are supplied during Passover.
• Regal Kosher (code KSML) - Strict Kosher meals prepared by "Regal" kashrut supervision and may also incorporate fresh fruit or sealed items, such as individually packaged bagels that meet Kosher laws. Special Kosher for Passover meals are supplied during Passover.
Only served on JFK-TLV, all cabins.
• Low Fat/Low Cholesterol/Low Calorie Meal (code LFML) - High fiber meal with reduced amounts of fat and sugar.
• Low Sodium Meal (code LSML) - Excludes use of salt, MSG and baking soda/powder, instead herbs and spices are used to flavor the meal.
• Muslim Meal (code MOML) - Does not contain pork, by‐products of pork or foodstuffs containing alcohol. All meats come from ritually slaughtered animals.
• Toddler Meal (code TDML) - Available for children who have begun consuming solid food who need little assistance from the parent, soft, easy‐to‐eat finger foods.
• Vegetarian (Vegan) Meal (code VGML) - Typically cooked in Western style, this meal does not contain meat, seafood, egg and dairy products.
• Vegetarian (Lacto-Ovo) Meal (code VLML) - Prepared in Western style, this is a non‐strict vegetarian meal which can include eggs and dairy products but eliminates all meats and seafood.
• Korean Meal (code KRML) - Korean style Bibimbap with steamed rice, gochujang sauce and sesame oil accompanied by soup, salad and banchan.
Available only to D1 customers flying between the USA-Korea.
• Chinese Meal (code CNML) - Components include soup, salad and entrée and feature regional flavors on flights departing China.
Available only to D1 customers flying between the USA-China.
