When must a flight plan be submitted?

Where a flight plan is required, it must be submitted before departure to an air traffic services reporting office or, during flight, transmitted to the appropriate air traffic services unit or air-ground control radio station, unless arrangements have been made for submission of repetitive flight plans (RPLs).



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So, as a general answer, in the U.S., flight at altitudes at and above 18,000 feet (5.49 km) above mean sea level requires a flight plan (an Instrument Flight Rules flight plan - known as IFR) and joyriding/offroading as you put it, is not permitted.

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VFR flight plans must be filed whenever an aircraft plans a cross-country flight and plans to operate under VFR flight rules. However, VFR flight plans are not required, only strongly recommended by the FAA, when an aircraft flies through class B airspace.

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No, pilots are not required to file a flight plan for every flight, but it is recommended for all flights, especially those that will be conducted outside of controlled airspace. Pilots flying under instrument flight rules (IFR) are required to file a flight plan.

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You haven't flown through IMC without a clearance, have you? Technically, you can fly in IMC without a clearance in Class G airspace, because it's not controlled. Controlled airspace simply means you need a clearance to fly in the clouds. Class G airspace is uncontrolled, so it's not illegal to fly in the clouds.

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Flight plans are among the lesser-known public records. Often confused with flight manifests, these seemingly random assortments of numbers and letters contain extensive information that could be useful in litigation or in verifying an individual's claimed whereabouts.

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In most countries, flight plans are required for flights under IFR, but may be optional for flying VFR unless crossing international borders. Flight plans are highly recommended, especially when flying over inhospitable areas such as water, as they provide a way of alerting rescuers if the flight is overdue.

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No person may operate an aircraft under basic VFR when the flight visibility is less, or at a distance from clouds that is less, than that prescribed for the corresponding altitude and class of airspace.

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Flights. Aircraft within Class B airspace are required to operate in accordance with current IFR procedures.

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