Final answer:
Flight attendants typically deliver 1st class service during the cruise phase of a flight.
Step-by-step explanation:
Flight attendants (FA's) typically deliver 1st class service from a beverage/meal cart during the cruise phase of a flight.
During boarding and taxi, FA's are usually busy attending to other tasks such as helping passengers with their luggage, ensuring safety procedures are followed, and preparing the cabin for takeoff.
During landing, FA's are required to secure the cabin, perform safety checks, and assist passengers.