What the Panorama programme missed was the fantastic job that the airlines and crews do in planning and loading the minimum amout of fuel needed on each sector taking into account the weather and expected delays.
Compare this to a BBC producer that drives a large car into central London probably with a full tank of fuel because he or she can't be bothered to calculate his fuel requirement for the trip and fill his tank accordingly.
Could a BBC whistleblower tell us what car the producer drives and where from so we can calculate the CO2 emitted.
STOP PRESS
BBC Panorama progamme looking for whistleblower to reveal how airlines fly over built up areas with only a minimum amount of fuel on board.