Final answer:
The boarding PA on an Airbus A319/20 is typically made by the Cabin Manager or a designated cabin crew member. The Captain and First Officer usually speak to passengers for flight-related updates, while ground crew involvement in boarding announcements is less common.
Step-by-step explanation:
The person responsible for making the boarding Public Address (PA) announcements on an Airbus A319 or A320 can vary depending on the airline's procedures. However, standard protocol typically assigns this responsibility to the Cabin Manager or a designated member of the cabin crew. These announcements include welcoming passengers aboard, providing safety instructions, and informing about the flight's progress.
The captain will make announcements pertaining to flight information or any irregular situations, and the first officer may also speak to passengers if required, but they are generally not responsible for the routine boarding announcements. The option of the ground crew making boarding announcements is less common and would likely only happen in specific situations where the cabin crew is not yet on board or available.