Brain Potter,
Glad to hear I got the clearance "at your discretion" correct. I will certainly remember those words as long as I live! As a TVOC Avionics Technician, new to FIS work and recently fresh from the dreaded RT course, I was only too aware of
not being able to give clearance for take off per se. To say I was under pressure in the runway waggon would be a definite understatement. However, it was all worthwhile and a grand old lady took to the sky with some style and amidst hugh emotion.
However, surely the title of the painting is correct? As he had been cleared to take off at his own discretion, the pilot must then have cleared himself and was therefore "cleared for take off"??? QED