BU, as usual, hit all the right beats. Two things I'll add:
- Hold off on salary questions/discussion unless the interviewer brings it up. On a first interview, it's more of a "get to know you", and for you to get to know them. If they like you, a phone call or second interview will follow, and that's the time to get down to brass tacks. Talk of money at the first meeting may put some people off. But, if they bring it up, or you get the sense that they are ready to hire you, or you are sure this is the only chance you'll have to talk with them, then go for it. But in general money discussions are more a part of the job offer negotiations than the initial interview.
- Ask about what sort of OpsSpecs or SOPs they have. If they say, "huh?" then that's probably not a good sign. If they have at least a set of guidelines (assuming it's Part 91), then I think that shows there's some thought to procedures and proper leadership/management of the operation.