The state government has very recent precedent of subsidizing nonstop flights [1], because it recognizes that they are key to drawing external investment in the city. This year, taxpayers voted to add a new north/south rapid transit line [2]. Maybe more importantly; public transit isn't as important in indy as it is in other cities. Substantially lower cost of living and a more sparse downtown allows driving to be more affordable, the city has some of the best traffic [3] of any major metropolitan area worldwide, and it is very bike friendly [4] with the downtown trails and a growing downtown core.
[1] http://onemileatatime.boardingarea.com/2017/09/06/delta-indi...
[2] http://www.indystar.com/story/news/local/marion-county/2017/...
[3] http://www.indianapolismonthly.com/the-hoosierist/hoosierist...
[4] https://www.rewardexpert.com/blog/studies/2017s-best-destina...