There's very little point to asking for a registration before you're on the aeroplane. Aircraft get swapped around so often, right up to (and sometimes even after) doors-closed. What was scheduled to operate a service a week or a few days or even a few hours out can often bear very little resemblance to what actually ends up doing the flight. Aeroplanes break down, come in late or get stuck somewhere inconvenient through weather or volcanic ash. Swaps get made to try and rescue the schedule, and keep being made as situations develop further.
So while in and of themselves, rego requests cause very little harm, they are for any practical purpose completely useless.
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