@Jack, that's where I'd start. Sounds like a solid plan.
The question is, where to find that info. The airport is old, and Error and Bookworm might both know that. It's pretty small, and is not the commercial airport in town, so that's a bonus for the team. It's age might mean that even though gov. installations are not likely to be on the public grid, some info about the airport may be.
Niles Gray should be easy to find info on. It's a legal SIN, and he's an above-ground cat, so that's also in the team's favor.
The Putas de Muerte are another story. Shadow contacts, and some deep matrix digging are the most likely candidates there.