I think it is hard to make the case for light rail to the airport unless the community has already installed it at the other places where it makes more sense i.e. to/ from high density residential to high density employment/public facilities... But, it might be argued if you were to combine it with the removal of parking at the airport (esp. long term) that it would reduce highway congestion
Rail to airports will also be used to bring the workers to the field, whether they are TSA screeners, counter workers or others.

Not a first link, but a good one after the core is developed (depending on the location of the airport relative to housing/work/entertainment centers).