the main reason for ordering food in first class is that it provides passengers with more high-end services. The following is a detailed answer to this question:

1. The main reason for ordering food in first class is that it provides personalized service for passengers. Because first-class passengers usually pay higher fares, they expect higher quality service. Ordering service allows passengers to choose their favorite dishes according to their own tastes and needs, thus improving their satisfaction.

2. as for the supply of ingredients, it is not necessary to transport them to the plane for cooking. In fact, airlines will cooperate with designated catering suppliers in advance to provide cooked, frozen or refrigerated meals for passengers. These meals are pretreated and packaged in the ground kitchen, and then heated properly on the plane for passengers to enjoy.

3. Some airlines also allow passengers to book meals in advance. Passengers can book online or by phone and choose the meals they want to enjoy during the flight. This way can realize more personalized catering needs and provide more choices for passengers.

to sum up, you can order food in first class, mainly to provide personalized service. The ingredients don't need to be transported to the plane for cooking, but are provided to passengers by booking in advance and cooperating with designated catering suppliers.