ATC Tower Cab Block 5 Practice Test

The correct answer is based on the standard procedures that dictate the minimum separation time required between departing aircraft, particularly when dealing with wake turbulence or the specific spacing standards set by air traffic control regulations.

In this scenario, when UAL10 rotates, there is a necessary consideration for wake turbulence separation, which is particularly important for aircraft departing behind larger aircraft. The minimum time N123JL must wait after UAL10 rotates is typically set at three minutes. This interval allows sufficient time for the wake turbulence generated by the departing aircraft to dissipate, ensuring a safer departure for the following aircraft.

A departure time of one or two minutes would not provide enough separation for adequate safety, which is why those options are inadequate. Similarly, while waiting four minutes does offer an additional safety margin, it exceeds the minimum requirement set in this context. Therefore, three minutes strikes the right balance of safety and efficiency in air traffic management, making it the correct and optimal choice for N123JL’s departure time following UAL10's rotation.