What is the name of the meal served on an airplane during a flight?

What is the term used to describe a selection of pre-packaged food items, such as sandwiches, cookies, and snacks, available for purchase on a flight? 


What is the term used to describe the special meal request made by passengers with specific dietary requirements, such as vegetarian, gluten-free, or kosher?



What is the name of the trolley used to serve meals and drinks on a flight?

What is the term used to describe the different levels of meal service offered to passengers on a flight, such as first class, business class, or economy class?