"but friends tell me you can do what are called "client interviews" where the client, in this case Boeing, has the option of interviewing the actual people who will be assigned to work on your project."

LOL! Ahem. You'll discover that they get someone competent in for the phone interview and you'll later discover that the story is now that the person you spoke to was representative - in terms of skills, experience and competence - of the sort of person who'll actually doing the work, and is not the one doing it. Later still you'll discover that this is not the case.

Still, they're very cheap, aren't they?