I submitted resume to the HR email address. HR manager is very courteous and friendly. She responded within a week of resume submission. Talked to HR over the phone about my experience, and two weeks later was contacted to visit the location.
On site, I interviewed with two engineers. Each asking different aspect of what is expected of aeronautical engineer working at Frasca. One engineer asked me to write the formulae to use for a given time step in updating a vehicle position. Another engineer asked more physics questions like equations of motion for fixed wing aircraft and helicopters. Lastly, Frasca's engineering manager interviewed me on past experiences, asking more details about resume items. Engineering manager also asked me if I had any programming experience.
Overall very pleasant experience.