What are the core products provided by hotels and airplanes?

For a hotel, its core product must be accommodation and service, which is "let the guests sleep well" in layman's terms. Everything in the hotel is used to strengthen this core, and everything around it is meaningful. If the sound insulation is not good, it will wake the guests; If the light is not good, it will keep them awake; If the room smells bad, it will give the guests a sixth sense of boredom; And a good sleep is the highest level of hotel service.