Final answer:
When servicing cargo/passenger aircraft, passengers may be required to disembark for safety and operational reasons. They may later be given priority for boarding. Regulations for service animals during travel include harnessing and space restrictions.
Step-by-step explanation:
When concurrently servicing cargo/passenger aircraft, passengers may be required to disembark. This is to ensure safety while cargo operations are underway and to allow for the servicing of the aircraft. Passengers' presence on board may not always be possible due to security protocols and operational procedures. Additionally, once cargo loading and servicing are completed, passengers may be given priority for boarding to facilitate an on-time departure.
Procedures during the servicing of aircraft may also include specific regulations regarding service animals, which must be harnessed, leashed, or tethered at all times in the airport and on the aircraft. Moreover, the number of service animals may be limited, and they are required to fit within the passenger's foot space on the aircraft.