John Osmond, Director of the Institute of Welsh Affairs, told us "Cardiff Airport is in the wrong place in relation to the population of the region."
The think tank has acknowledged that Bristol Airport is more successful, but argues that neither existing airport is in an ideal location, or has good enough regional transport links.
More top news
The whole of Wales is covered by a yellow warning to be aware of very strong winds developing tonight.
Did you miss any of our coverage? Catch up here on Wales at Six.
Catherine Herridge made a remarkable discovery...