How do controllers transfer details of flights leaving their sector?

Answer: B — Computer link or telephones

Controllers transfer details of flights leaving their sector predominantly through computer links or telephones. This method facilitates efficient communication of flight information, such as flight plans, altitudes, and any special instructions that may be necessary. The use of computer links allows for a quick and accurate transfer of data, which is essential in maintaining safety and operational efficiency in air traffic control. Handheld radios are primarily used for communication in specific operational situations, but they are not the primary method for transferring detailed flight information when handing over to another sector. Visual displays may assist in tracking flights but do not serve as a communication method for transferring details. Text messages could be impractical for complex flight information transmission due to potential delays and the risk of miscommunication. Therefore, the use of computer links or telephones stands out as the most reliable and effective approach in ensuring that all pertinent details regarding flights transitioning between sectors are communicated clearly and promptly.