Your fingers are firmly in your ears! So Scotland must move around 25 million pax (using your very off figures). 50% of that is 12.5 million pax. Yet all 4 Yorkshire airports move much less than 5 million passengers! That is because more people are leaving the region to fly than are staying in it due directly to location of airport/ characteristic of airport/number of internal competing airports.
Thank you pug for totally and unreservedly proving the case for the improvement of Yorkshire airport strategy. Can Yorkshire do better - 100% yes and pug proves it!