An aircraft ID may contain up to how many characters?

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Multiple Choice

An aircraft ID may contain up to how many characters?

Explanation:
An aircraft identification is the call sign or flight ID used to identify a flight in air traffic control and on flight plans. This field is limited to seven characters, a constraint that keeps the ID concise enough to transmit reliably and to fit within the data blocks and display systems used by controllers and radar. Because of this limit, IDs are composed of a mix of letters and digits within seven characters, such as a registration or a company flight number. If the ID were longer than seven, it would be truncated or rejected by the systems, which is why seven is the maximum.

An aircraft identification is the call sign or flight ID used to identify a flight in air traffic control and on flight plans. This field is limited to seven characters, a constraint that keeps the ID concise enough to transmit reliably and to fit within the data blocks and display systems used by controllers and radar. Because of this limit, IDs are composed of a mix of letters and digits within seven characters, such as a registration or a company flight number. If the ID were longer than seven, it would be truncated or rejected by the systems, which is why seven is the maximum.

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