Final answer:
A flight crew member on standby must be ready to show up for duty promptly, reflecting the necessity for operational readiness and the importance of maintaining airline schedule and safety.
Step-by-step explanation:
When a flight crew member is on standby, they need to be able to show up on time for duty, often with very little notice. This requirement is analogous to airline passengers needing to arrive early for their flights, as detailed in the provided reference about the rate-limiting steps in airline travel. Moreover, for an airline crew, timing is even more crucial since they are part of the operational staff that ensures the flight's success. Therefore, showing up to work is not just about being there for the designated shifts, but being ready to step in when unexpected situations arise, as one must also be prepared to do when faced with regulatory requirements such as documentation for service animals or alike. Particularly in the aviation industry, being on standby implies a state of readiness to act at a moment's notice, to maintain the schedule and safety of air travel.