Leeds Approach, one thing you fail to grasp is that research (including the recent Transport for the North study on International Connectivity) demonstrates that the population of Yorkshire - and Sheffield as it happens - have a much lower propensity to fly than areas like Greater Manchester, Cheshire and Warrington and Liverpool. As such, the size of the catchment or the location of the airport itself, doesn't make much of a difference. Basically Yorkshire folk don't fly that much. As Chaps1954 suggests, 10-15 million passengers is a pipe dream...