I took a similar line and told him that a typical car weighing 1,000Kg would accelerate at the same rate as a 50,000Kg 737 so therefore the latter was that many times more powerful. Another comparison was the fuel burned in unit time when cruising assuming the calorific value of kerosene and petrol are similar. The 737 is using 2,400Kg / hr in cruise whereas the average car uses just 8 Kg / hour.