What phrase should a pilot use when prepared for takeoff?

A pilot should use the phrase "Cleared for takeoff" when they are prepared for takeoff. This phrase indicates that the pilot has received official clearance from air traffic control, which is a critical component of aviation safety and protocol. It shows that the pilot acknowledges the tower's authorization to proceed with the takeoff, ensuring that all necessary airspace and runway checks have been completed. It confirms that the aircraft is in a position to take off and that it is safe to do so.

Using other phrases such as "Ready for departure" or "Requesting takeoff clearance" does not communicate the same level of authority and confirmation. "At your discretion, Tower" is also inappropriate in this context because it suggests that the pilot is deferring control back to the tower rather than affirmatively stating that they are ready and cleared to take off. Therefore, only "Cleared for takeoff" conveys the necessary permission and urgency for the takeoff action.