There are are a lot of options and choosing the best for you depends on your skills and long term motivation.
There are full time aviation degrees that will train you to fly professionally as well as developing your maths skills to the level where you can do complex statistical tasks (such as analyse safety or economic data, or identify new route viability etc) as well as providing a good background in what makes an airline run. The advantage of an aviation degree is that it will allow you a much better chance to remain in the industry if you lose your medical.
One option on the other side of the world (Sydney) is at UNSW: see
University of New South Wales - UNSW - Home. This offers a fleet of new Diamond DA40s at a university which rates in the top 50 internationally (according to their website) and which includes a good swag of quantitative academic subjects.