Etihad is offering 5,000 bonus miles for joining their BusinessConnect program. All you have to do is fill out their short registration form, the biggest catch of which is that you have to upload a copy of your EIN. Perhaps an SSN would work as well if you’re in the US, though I haven’t tried it.
Best I can tell there aren’t really any terms associated with the 5,000 mile bonus. There was no mention of it upon completing the form, though since I do have a legitimate business with an EIN I figured I might as well give it a shot. 5,000 miles is a pretty hefty bonus, even if it’s an otherwise lesser used program.
(Tip of the hat to TJ On Miles & Points)