Final answer:
When a flight crew needs to re-file a flight plan in-flight, the captain will assess the impact on the planned fuel burn and take appropriate action if the deviation is significant.
Step-by-step explanation:
When a flight crew is in direct communication with Air Traffic Control (ATC) and needs to re-file a flight plan, they will coordinate with the captain, who will assess the impact on the planned fuel burn.
If the deviation significantly affects the planned fuel burn, the captain will take appropriate action to ensure that the aircraft has enough fuel for the duration of the flight. This may include requesting additional fuel from ATC or making adjustments to the flight plan such as altering the route or reducing speed.
The captain's main priority is to ensure the safety and efficiency of the flight, so they will carefully evaluate the situation and make decisions accordingly.