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Throughout the transcript, pilots frequently identify their aircraft using call signs, which helps maintain clarity among multiple aircraft on the same frequency. For example, United 93 and Continental 842 consistently check in with ground control, confirming their readiness for pushback and taxiing.
To improve efficiency, pilots are instructed to monitor specific frequencies and await further instructions. This ability to switch frequencies is crucial as it allows ground controllers to manage air traffic dynamically and respond to changing circumstances, such as delays or route adjustments.