Who is responsible for canceling an IFR flight plan when landing at an airport without a functioning control tower?

The pilot is responsible for canceling an IFR (Instrument Flight Rules) flight plan when landing at an airport without a functioning control tower. This procedure is essential because it ensures that air traffic control is aware that the flight has safely landed and that they no longer need to monitor or manage that flight's operations.

When an aircraft arrives at a non-towered airport, it is crucial for the pilot to communicate their landing status. This communication typically occurs via radio or by calling a Flight Service Station. It helps to alleviate any confusion regarding the flight's status and enables air traffic control to maintain an accurate understanding of active flight plans in the airspace.

The pilot has the knowledge and authority to cancel the flight plan because they are responsible for the safe operation of the aircraft and must make decisions regarding its status. Other parties, like the co-pilot or dispatch team, may assist or provide support, but ultimately, it is the responsibility of the pilot to ensure that the flight plan is appropriately canceled to reflect the aircraft's current status post-landing.