Final answer:
NORDO or RONLY aircraft indicate readiness for takeoff during the day by positioning the aircraft on the runway and using visual signals, such as flashing the landing or navigation lights.
Step-by-step explanation:
In aviation, a NORDO (No Radio) or RONLY (Receive Only) aircraft is one that cannot communicate with air traffic control (ATC) via radio transmission. When such an aircraft is ready for take-off during the day, it typically communicates its intentions through visual signals. This often involves the pilot positioning the aircraft at the hold short line or into the takeoff position on the runway and using light signals. For instance, by daylight, the pilot may flash the landing or navigation lights in a manner that is visible to the control tower to indicate readiness for departure. It is crucial for pilots of NORDO or RONLY aircraft to be familiar with the airfield's specific light signal procedures and any visual cues that ATC might use to provide clearance without radio communication.